Clues Your Blood Sugar Is Too High

1. Frequent Urination

One of the earliest and most noticeable signs of elevated blood sugar is frequent urination, medically known as polyuria. When glucose levels in the blood rise excessively, the kidneys work harder to filter and remove the extra sugar. If they cannot keep up, excess glucose is excreted in the urine, drawing more water from the bloodstream and resulting in increased urine output. This process is different from dehydration, where the body produces less urine to conserve fluids. With high blood sugar, the body actually loses more fluid, which can eventually contribute to dehydration if not addressed.

People with high blood sugar may find themselves visiting the bathroom more often than usual, including during the night (nocturia). Monitoring your bathroom patterns can be a practical way to detect early signs of hyperglycemia. If you notice a significant change in urination frequency without an obvious cause—such as increased fluid intake—it may be time to consult a healthcare provider. For more detailed information about polyuria and its connection to diabetes, visit the American Diabetes Association and the CDC’s blood glucose resources.

2. Excessive Thirst

Another classic indicator of high blood sugar is excessive thirst, known medically as polydipsia. When your body tries to rid itself of excess glucose through increased urination, it also loses significant amounts of water. This rapid fluid loss triggers the brain to signal a need for replenishment, resulting in an unquenchable thirst. The sensation can be likened to the intense thirst you might feel after consuming salty foods, only more persistent and difficult to satisfy.

Unlike typical thirst that resolves after drinking water, the thirst caused by hyperglycemia often lingers, regardless of how much you drink. This relentless need to hydrate is the body’s attempt to restore fluid balance and dilute the excess sugar in the bloodstream. If you find yourself constantly reaching for water without relief, it may be a sign worth noting and discussing with a healthcare provider. Chronic, unexplained thirst is a hallmark symptom that should not be ignored. For further reading on the relationship between blood sugar and thirst, visit the National Institute of Diabetes and Digestive and Kidney Diseases and the Mayo Clinic.

3. Unexplained Fatigue

Unexplained fatigue is a frequent, yet often overlooked, symptom of elevated blood sugar. When glucose levels are high, your body may be unable to effectively transport sugar from the bloodstream into cells due to insufficient insulin or insulin resistance. As a result, cells are starved for energy despite an abundance of circulating glucose. This energy deficit can leave you feeling persistently tired and drained, similar to the sensation of “hitting the wall” during a marathon when the body’s energy stores are depleted.

The exhaustion associated with high blood sugar often does not improve with rest, and may seem disproportionate to your daily activities. If you notice that you are experiencing low energy or fatigue that cannot be explained by lack of sleep, stress, or physical exertion, it’s important to track these episodes. Keeping a journal of your fatigue patterns can help you and your healthcare provider identify potential blood sugar issues. For additional information on the link between diabetes and fatigue, visit the Diabetes.co.uk resource and the CDC’s guide to diabetes fatigue.

4. Blurry Vision

Blurry vision is a common and sometimes alarming symptom of elevated blood sugar. When glucose levels rise, the sugar can pull fluid from tissues throughout the body, including the lenses of your eyes. This shift in fluid balance alters the shape and flexibility of the lens, leading to blurred or distorted vision. The experience can be compared to wearing foggy glasses: everything appears less clear, and you may have trouble focusing on details or reading fine print.

These changes in vision can develop rapidly and may fluctuate as blood sugar levels rise and fall. In most cases, vision returns to normal after blood sugar stabilizes, but persistent or severe blurriness requires prompt medical attention. Ignoring sudden changes in eyesight can delay the diagnosis of underlying conditions, including diabetes. Long-term uncontrolled blood sugar can also damage the blood vessels in the retina, leading to diabetic retinopathy. If you notice sudden or recurring episodes of blurry vision, it’s important to consult a healthcare provider. For more information about how diabetes impacts vision, visit the American Academy of Ophthalmology and the CDC’s diabetes and eye health page.

5. Slow-Healing Wounds

High blood sugar can significantly impair the body’s natural healing processes, resulting in wounds that heal much more slowly than usual. Elevated glucose levels damage blood vessels and decrease circulation, making it harder for oxygen and essential nutrients to reach injured tissues. This compromised blood flow means that even minor cuts, scrapes, or bruises may persist for weeks or become prone to infections. For example, a small paper cut or blister that would normally heal in a few days might linger, remain red, or even worsen over time.

People with consistently high blood sugar should be particularly vigilant with skin injuries. Slow-healing wounds can be a warning sign of underlying diabetes and, if left untreated, may lead to serious complications such as ulcers or infections. It is essential to monitor all cuts and sores, especially on the feet and lower legs, and seek medical advice if healing seems unusually delayed. Early intervention can prevent more severe health issues from developing. For further reading on the connection between blood sugar and wound healing, see the American Diabetes Association’s skin complication resources and the CDC’s guide to diabetes and foot care.

6. Increased Hunger

Persistent hunger, known medically as polyphagia, is another key clue that blood sugar levels may be too high. When your body cannot efficiently move glucose from the bloodstream into cells—often due to insufficient insulin or insulin resistance—the cells are deprived of their primary energy source. This cellular starvation triggers the brain to send out hunger signals, urging you to eat more to compensate for the lack of usable fuel. The sensation can be compared to driving a car with an empty fuel tank: no matter how much gas you add, the engine doesn’t run properly if the fuel isn’t reaching it.

Unlike normal hunger, which typically occurs after extended periods without eating or after physical exertion, the hunger associated with high blood sugar is constant and difficult to satisfy. It may persist even shortly after meals, leading to overeating and weight changes. Noticing a pattern of insatiable hunger, especially in combination with other symptoms, is a reason to seek medical advice. To learn more about the connection between blood sugar and appetite, visit the National Institute of Diabetes and Digestive and Kidney Diseases and the CDC’s diabetes symptoms page.

7. Tingling or Numbness

Tingling or numbness in the hands, feet, or legs can signal nerve damage, also known as neuropathy, resulting from prolonged high blood sugar. Excess glucose can injure the tiny blood vessels that supply nerves, especially in the extremities. This damage disrupts normal nerve function, leading to sensations described as tingling, burning, numbness, or “pins and needles.” Much like the feeling you get when a limb “falls asleep,” these symptoms may start subtly but can become more pronounced and persistent over time.

Unlike the temporary tingling from sitting in an awkward position, neuropathy-related sensations often do not go away quickly and may worsen at night. If left untreated, neuropathy can progress, causing significant discomfort, loss of sensation, and even increasing the risk of injuries due to decreased awareness of pain or temperature. Monitoring for persistent tingling, numbness, or unusual sensations—especially in your feet and hands—is crucial for early detection and management of blood sugar issues. For more information about diabetic neuropathy, visit the National Institute of Diabetes and Digestive and Kidney Diseases and the CDC’s feature on diabetes and nerve damage.

8. Recurrent Infections

Frequent infections are a significant warning sign that blood sugar may be elevated. High glucose levels create an environment where bacteria and yeast thrive, making infections more likely and harder to resolve. For example, urinary tract infections (UTIs) and yeast infections are notably more common in people with consistently high blood sugar, as the excess sugar in urine and tissues provides fuel for microbial growth. Similarly, skin infections, gum infections, and slow-healing wounds can also occur more frequently due to weakened immune defenses.

The body’s immune system becomes less effective when blood sugar is not well controlled, further increasing susceptibility to both common and unusual infections. If you notice that you are experiencing recurrent infections—such as frequent UTIs, persistent fungal infections, or repeated skin problems—it’s important to consult a healthcare provider. Prompt action can help identify underlying blood sugar imbalances and prevent more serious complications. For additional information about diabetes and infection risk, visit the CDC’s resource on diabetes and infections and the American Diabetes Association’s guide to infections and diabetes.

9. Unintentional Weight Loss

Unintentional weight loss is a less obvious, yet significant, clue that blood sugar levels may be too high. When the body is unable to use glucose effectively for energy—either due to a lack of insulin or insulin resistance—it begins to break down fat and muscle tissue to meet its energy needs. This process is similar to what happens during a crash diet, where the body rapidly burns through its own stores to compensate for the lack of fuel. However, in the context of high blood sugar, this weight loss occurs even if you are eating normally or have a healthy appetite.

Such unexplained weight changes are concerning because they often indicate underlying metabolic issues, including undiagnosed diabetes. The weight loss may be accompanied by muscle wasting and a general decline in physical strength. Noticing a pattern of dropping pounds without trying—especially in combination with other symptoms of high blood sugar—should prompt a visit to a healthcare provider for evaluation. For more insight into how diabetes and high blood sugar can cause weight loss, visit the American Diabetes Association’s symptoms page and the National Institute of Diabetes and Digestive and Kidney Diseases.

10. Dry Mouth

Dry mouth, or xerostomia, is another sign that may indicate elevated blood sugar levels. When blood sugar is high, the body often loses fluids through increased urination, which can lead to dehydration. As a result, the production of saliva decreases, leaving your mouth feeling parched. This sensation is similar to what you might experience after eating a particularly salty snack, where your mouth feels sticky and uncomfortable no matter how much water you drink.

Persistent dry mouth can cause difficulty swallowing, a rough or dry tongue, and even lead to oral health issues such as tooth decay and gum disease. Unlike temporary dryness that resolves quickly, the dryness associated with high blood sugar tends to linger and may be accompanied by a burning sensation or cracked lips. If you consistently notice a dry mouth, especially alongside other symptoms of high blood sugar, it’s important to mention this to your healthcare provider. For more on how diabetes and high blood sugar impact oral health, visit the CDC’s guide to diabetes and oral health and the American Dental Association’s diabetes resource.

11. Headaches

Headaches are a common but often overlooked symptom that can be triggered by fluctuating blood sugar levels. The brain relies heavily on a steady supply of glucose to function optimally. When blood sugar levels rise and fall rapidly, or remain consistently high, it can disrupt the brain’s chemical balance and blood flow, resulting in discomfort or pain. This kind of headache can feel similar to the dull, nagging ache you might experience after skipping a meal or fasting for an extended period—your brain simply isn’t getting the fuel it needs.

Frequent or persistent headaches, especially when paired with other symptoms of high blood sugar, should not be dismissed. These headaches may come and go, or they may become a regular occurrence, interfering with daily activities and overall well-being. Keeping a diary to track the timing and frequency of headaches can help you and your healthcare provider identify patterns related to blood sugar control. For more information about the relationship between blood sugar and headaches, visit the CDC’s list of diabetes symptoms and the American Diabetes Association’s symptoms resource.

12. Difficulty Concentrating

Difficulty concentrating is a subtle yet impactful symptom that can arise when blood sugar levels are too high. Glucose is the main source of energy for the brain, and when its delivery is disrupted by elevated blood sugar, mental functions can suffer. This can result in what many describe as “brain fog”—a state where thoughts feel slow, memory is less sharp, and it’s challenging to focus on tasks. It often feels like trying to think through a thick haze, making even simple decisions or conversations more taxing than usual.

Problems with attention can interfere with work, learning, and daily activities, and these lapses in concentration may become noticeable to others as well. If you find yourself frequently losing your train of thought, struggling to complete tasks, or needing more time to process information, it could be a clue that your blood sugar is out of balance. Monitoring these cognitive changes alongside other symptoms can help with earlier detection and management. For further reading about the impact of blood sugar on cognitive function, see the CDC’s guide to diabetes and mental health and the American Diabetes Association’s mental health resources.

13. Irritability

Irritability and mood swings are often linked to fluctuations in blood sugar levels, particularly when those levels are consistently high. The brain is highly sensitive to changes in glucose, and when it doesn’t receive a steady supply, emotional regulation can be disrupted. This can result in feelings of frustration, impatience, or anger that seem out of proportion to the situation. The experience is similar to being “hangry,” where hunger leads to irritability, except in this case, the mood changes are tied to unstable sugar rather than lack of food.

People with high blood sugar may notice that they are more easily annoyed or find it harder to manage stress and negative emotions. These mood changes can strain relationships and impact performance at work or school. If you or those close to you observe a pattern of increased irritability, especially when accompanied by other symptoms of high blood sugar, it’s important to pay attention. Monitoring your mood and discussing persistent changes with your healthcare provider can be a key step in identifying and managing blood sugar issues. To read more about the psychological effects of diabetes, visit the CDC’s page on diabetes and mental health and the American Diabetes Association’s mental health resource.

14. Frequent Skin Itching

Frequent skin itching is another symptom that can signal elevated blood sugar levels. When glucose remains high, the body loses fluids through increased urination, leading to dehydration and dry skin. This dryness can cause persistent itchiness, similar to the way your skin might feel during the winter months when cold air and indoor heating sap moisture from your skin. In addition, high blood sugar can impair circulation and compromise the immune system, making the skin more susceptible to infections, rashes, and irritation that further aggravate itching.

Persistent or widespread itching—especially on the legs, arms, or lower back—should not be ignored, as it may indicate underlying blood sugar issues. People with diabetes are also more prone to fungal and bacterial skin infections, which can cause additional discomfort and itching. If you notice that your skin is frequently dry, flaky, or itchy, even after using moisturizers, it’s a good idea to discuss these symptoms with your healthcare provider. For more information on how diabetes affects the skin and ways to manage itchy skin, visit the American Academy of Dermatology’s guide to diabetes skin problems and the CDC’s diabetes and skin health resource.

15. Dark Patches on Skin

Dark patches of skin, known as acanthosis nigricans, can be a physical clue of chronically elevated blood sugar. This condition is characterized by areas of skin that become darker, thicker, and often velvety in texture. These patches typically appear in body folds where skin rubs together, such as the neck, armpits, groin, or under the breasts. Acanthosis nigricans is closely associated with insulin resistance, a hallmark of prediabetes and type 2 diabetes, and is often an early warning sign of underlying metabolic issues.

These skin changes are not simply cosmetic—they indicate that the body is having trouble using insulin effectively. If you notice new, unexplained dark, velvety patches developing on your skin, it’s important to consult a healthcare provider for evaluation. Early identification of acanthosis nigricans can help prompt timely testing and intervention for blood sugar imbalances. For more information about this skin condition and its relationship to diabetes, visit the American Academy of Dermatology’s acanthosis nigricans overview and the CDC’s guide to diabetes-related skin complications.

16. Fruity-Smelling Breath

Fruity-smelling breath is a distinctive and potentially serious clue that blood sugar levels are dangerously high. This symptom occurs when the body, unable to use glucose for energy, begins breaking down fat for fuel. This process produces ketones, which can accumulate in the blood and are partially expelled through the breath, giving it a sweet, fruity, or even nail polish remover-like odor. This is often a sign of diabetic ketoacidosis (DKA), a medical emergency most common in people with type 1 diabetes, but it can also occur in type 2 diabetes if blood sugar is severely uncontrolled.

If you or someone you know develops fruity-smelling breath, especially in conjunction with symptoms like nausea, vomiting, confusion, or rapid breathing, it is critical to seek medical attention immediately. DKA can progress quickly and become life-threatening without prompt treatment. For more information about ketone buildup and diabetic ketoacidosis, visit the CDC’s page on diabetic ketoacidosis and the American Diabetes Association’s resource on ketoacidosis.

17. Nausea

Nausea can occur when blood sugar levels are excessively high, and it is often linked to the buildup of ketones and dehydration. As the body shifts from using glucose to burning fat for energy, ketones accumulate in the bloodstream and can have toxic effects, leading to symptoms such as nausea and vomiting. Additionally, persistent dehydration caused by frequent urination further aggravates feelings of queasiness. This type of nausea can feel similar to the discomfort experienced during a stomach bug or food poisoning, but it is related to metabolic imbalances rather than an infection.

Frequent or unexplained episodes of nausea, especially when accompanied by other symptoms like fatigue, fruity-smelling breath, or rapid breathing, may signal a potentially dangerous condition such as diabetic ketoacidosis (DKA). If you experience ongoing nausea without a clear cause, it is important to seek medical evaluation, as this could help prevent more serious complications. For more information about the relationship between high blood sugar, ketones, and nausea, visit the CDC’s overview of diabetic ketoacidosis and the American Diabetes Association’s resource on ketoacidosis.

18. Vomiting

Vomiting can be a sign that blood sugar levels have reached a dangerously high threshold. When the body is unable to utilize glucose for energy and begins to break down fat, ketones build up in the bloodstream. High concentrations of ketones can trigger the body’s protective mechanisms, leading to nausea and eventually vomiting in an effort to rid the body of excess toxins. This reaction can be similar to the abrupt and intense vomiting experienced with food poisoning, but in this case, it is a response to metabolic stress rather than a gastrointestinal infection.

Vomiting due to severe sugar spikes is often a symptom of diabetic ketoacidosis (DKA), a medical emergency that requires immediate attention—especially if accompanied by other warning signs such as fruity-smelling breath, rapid breathing, confusion, or abdominal pain. Ignoring these symptoms can lead to life-threatening complications and should be treated as an urgent situation. If vomiting occurs in conjunction with high blood sugar or other signs of DKA, seek medical help right away. For more on this topic, visit the CDC’s guide to diabetic ketoacidosis and the American Diabetes Association’s ketoacidosis resource.

19. Rapid Heartbeat

A rapid heartbeat, or tachycardia, can occur when blood sugar levels are too high. Elevated glucose often leads to dehydration, as the body attempts to flush out excess sugar through increased urination. This loss of fluids reduces blood volume, prompting the heart to beat faster to maintain adequate circulation. Additionally, high blood sugar triggers the release of stress hormones like adrenaline, which can further increase heart rate. The sensation may be similar to how your heart races after a sprint or intense exercise, even if you haven’t been physically active.

Palpitations or a persistently fast heartbeat may feel unsettling and are sometimes accompanied by feelings of anxiety, lightheadedness, or weakness. These symptoms should not be ignored, especially if they occur alongside other signs of high blood sugar such as excessive thirst, fatigue, or nausea. Monitoring your pulse and being aware of any unusual changes in your heart rhythm is important for early intervention. For more information about the link between blood sugar and cardiovascular symptoms, visit the CDC’s resource on diabetes and heart health and the American Heart Association’s overview of diabetes and the heart.

20. Muscle Cramps

Muscle cramps are another physical symptom that can indicate high blood sugar levels. When glucose is elevated, the body loses fluids and essential electrolytes such as potassium, magnesium, and sodium through increased urination. These electrolytes are crucial for proper muscle function, and their depletion can lead to painful cramps and spasms. The experience may feel similar to the muscle tightness or sudden cramps that occur after intense exercise or heavy sweating, even if you haven’t been particularly active.

Frequent or unexplained muscle cramps—especially in the legs, feet, or hands—may be a sign that your body’s fluid and electrolyte balance is disrupted by high blood sugar. These cramps can happen during the day or wake you up at night, interfering with your daily activities and sleep quality. If you notice recurring muscle issues along with other symptoms of elevated blood sugar, it’s important to discuss these with your healthcare provider. For more information on the connection between diabetes, electrolyte balance, and muscle health, visit the American Diabetes Association’s nerve damage resource and the CDC’s guide to diabetes and nerve health.

21. Recurrent Gum Disease

Recurrent gum disease is a common but often overlooked sign of high blood sugar. Elevated glucose levels in the blood and saliva can weaken the body’s ability to fight off bacteria, making the gums more susceptible to infections and inflammation. This can manifest as persistent redness, swelling, bleeding, or tenderness in the gums—symptoms that may not resolve with regular brushing and flossing. A real-world example is experiencing ongoing gum inflammation or frequent mouth sores that seem to return even after dental treatments or improved oral hygiene.

Uncontrolled blood sugar not only increases the risk of gum disease (gingivitis and periodontitis) but can also slow the healing process after dental procedures, compounding the problem. If you notice that your gums are frequently sore, swollen, or bleed easily, it’s important to seek dental attention and mention any other signs of high blood sugar to your healthcare provider. Early intervention can help prevent more severe dental complications. For more information on the link between diabetes and gum health, visit the CDC’s resource on diabetes and oral health and the American Dental Association’s diabetes and oral health page.

22. Poor Night Vision

Poor night vision can be a subtle yet important indicator that blood sugar levels are too high. Elevated glucose can damage the tiny blood vessels in the retina, the light-sensitive tissue at the back of the eye, leading to a condition known as diabetic retinopathy. This damage impairs the retina’s ability to process images properly, especially in low-light conditions. The experience can be likened to trying to see in a dimly lit room or struggling to distinguish shapes and colors while driving at night—details are harder to make out, and contrasts seem faded or blurry.

People may notice that they have increasing difficulty adjusting to darkness or moving between well-lit and poorly lit environments. These changes in night vision are sometimes gradual and can be overlooked until they interfere with daily activities like nighttime driving. If you observe that your ability to see clearly at night has worsened, it’s essential to mention this to your eye care professional, as it may be an early warning sign of diabetes-related eye complications. For more on how diabetes affects vision and night sight, visit the American Academy of Ophthalmology’s diabetic retinopathy resource and the CDC’s diabetes and eye health page.

23. Frequent Yeast Infections

Frequent yeast infections are another sign that blood sugar levels may be too high. Yeast, particularly the species Candida, thrives in environments rich in sugar. When glucose levels are elevated, excess sugar can accumulate in bodily fluids, creating ideal conditions for yeast to multiply. This is especially true in warm, moist areas such as the mouth (oral thrush) and vaginal region. For example, women might experience recurrent vaginal yeast infections, characterized by itching, irritation, and abnormal discharge, even after standard treatments.

These infections can be more stubborn and persistent in people with uncontrolled blood sugar, often returning shortly after resolving. Men can also experience yeast infections, particularly in the groin area. If you or your partner notice a pattern of frequent or recurring yeast infections, it’s important to consider underlying blood sugar issues as a potential cause and seek medical evaluation. Early detection and management of high blood sugar can help prevent further infections and complications. For more information about the relationship between diabetes and yeast infections, visit the CDC’s guide to diabetes and yeast infections and the American Diabetes Association’s infections resource.

24. Erectile Dysfunction

Erectile dysfunction (ED) can be an important clue that blood sugar levels are persistently high. Elevated glucose over time damages the blood vessels and nerves responsible for normal sexual function. Just as blocked or damaged plumbing can restrict water flow, compromised blood vessels impede the necessary blood supply to the penis, making it difficult to achieve or maintain an erection. This vascular damage is often compounded by neuropathy, as high sugar also impairs the nerves involved in arousal and response.

Men with diabetes or undiagnosed high blood sugar may notice ongoing difficulties with sexual performance, which can affect self-esteem and relationships. ED that does not resolve with lifestyle changes or persists despite addressing other possible causes should prompt a conversation with a healthcare provider. Addressing blood sugar management can often improve or resolve erectile dysfunction and prevent further vascular complications. For more on the connection between diabetes and erectile dysfunction, visit the CDC’s guide to diabetes and ED and the American Diabetes Association’s sexual health resource for men.

25. Polycystic Ovary Syndrome (PCOS) Worsening

Polycystic Ovary Syndrome (PCOS) is a hormonal disorder commonly associated with insulin resistance, which can be exacerbated by high blood sugar levels. When the body’s cells do not respond effectively to insulin, the pancreas compensates by producing even more, leading to further hormonal imbalances. This cycle can worsen PCOS symptoms, such as irregular menstrual periods, acne, unwanted hair growth, and difficulty with weight management. For example, women with PCOS may notice their cycles becoming even more unpredictable or experience increased symptoms as their blood sugar remains poorly controlled.

Monitoring for worsening PCOS symptoms is crucial, as they may be an early sign that blood sugar regulation is deteriorating. Addressing insulin resistance through lifestyle changes, medication, or other interventions can help manage both PCOS and blood sugar levels. If you have PCOS and observe changes such as more frequent missed periods, increased hair growth, or worsening acne, consider consulting your healthcare provider for a diabetes screening. For more information about the relationship between PCOS and blood sugar, visit the CDC’s PCOS and diabetes resource and the Office on Women’s Health PCOS page.

26. High Blood Pressure

High blood pressure (hypertension) frequently occurs alongside elevated blood sugar and can be an important indicator of underlying metabolic issues. Chronically high glucose levels damage the inner lining of arteries, causing them to stiffen and narrow—much like how clogged pipes restrict water flow in a plumbing system. This increased resistance forces the heart to work harder to circulate blood, ultimately raising blood pressure. Over time, the combination of high blood sugar and high blood pressure greatly increases the risk of heart disease, stroke, and other serious complications.

Many people with high blood sugar may not realize their blood pressure is also elevated, as both conditions can develop silently without noticeable symptoms. Regular blood pressure checks are essential, especially if you are at risk for diabetes or have already been diagnosed. Monitoring these numbers allows for early detection and intervention, helping to prevent long-term health issues. For more information about the relationship between high blood sugar, high blood pressure, and cardiovascular health, visit the CDC’s guide to high blood pressure and the American Heart Association’s resource on diabetes and high blood pressure.

27. Frequent Dizziness

Frequent dizziness can be a telling sign that blood sugar levels are too high. Elevated glucose leads to dehydration through increased urination, which reduces blood volume and impairs circulation. This can lower blood pressure or make it difficult for the body to maintain stable blood flow to the brain, resulting in sensations of lightheadedness or dizziness. The feeling may be similar to the brief dizziness experienced when standing up too quickly after sitting or lying down, but in this case, episodes can occur even without a change in position or apparent cause.

Dizziness related to high blood sugar may come and go or persist, sometimes accompanied by fatigue, blurred vision, or heart palpitations. It can interfere with daily activities and increase the risk of falls or accidents. Keeping track of when and how often dizziness occurs, especially alongside other symptoms, can provide valuable information for your healthcare provider. Early recognition and intervention are key to preventing more serious complications. For additional insight into dizziness and its relationship to diabetes, visit the CDC’s symptoms of diabetes page and the American Diabetes Association’s resource on diabetes symptoms.

28. Dry, Flaky Skin

Dry, flaky skin is a common physical sign of elevated blood sugar. When glucose levels are high, the body loses more fluids through increased urination, which leads to dehydration. This dehydration draws moisture away from the skin, leaving it feeling parched and rough. The sensation is similar to what many people experience during winter, when cold weather and indoor heating strip the skin of its natural oils, resulting in flakiness and irritation. In the case of high blood sugar, this dryness can be persistent and may occur year-round, not just during colder seasons.

If you notice your skin becoming dry, tight, or prone to peeling, it’s important to regularly moisturize and monitor for other symptoms of high blood sugar. Moisturizing can help soothe discomfort and protect the skin barrier, but addressing the underlying blood sugar issue is crucial for lasting relief. Persistent dryness, especially when paired with itching, slow-healing wounds, or infections, should prompt a conversation with your healthcare provider. For more information on how diabetes and high blood sugar impact skin health, visit the CDC’s diabetes and skin care page and the American Academy of Dermatology’s guide to diabetes skin problems.

29. Leg Pain While Walking

Leg pain while walking, known as claudication, can be a warning sign of poor circulation caused by persistently high blood sugar. Elevated glucose levels damage blood vessels over time, reducing blood flow to the extremities. As a result, muscles in the legs may not receive enough oxygen during physical activity, leading to pain, cramping, or heaviness—especially when walking or climbing stairs. This discomfort is often relieved by resting, only to return with renewed exertion, much like the muscle cramps athletes experience after intense activity but without the benefit of exercise-induced fitness.

New or worsening leg pain should not be ignored, as it may indicate peripheral artery disease (PAD), a serious complication associated with diabetes and high blood sugar. PAD increases the risk of infections, ulcers, and even limb loss if left untreated. If you experience unexplained pain, cramping, or weakness in your legs during activity, it is important to seek medical evaluation promptly. Early diagnosis and management can significantly improve outcomes. For more on how diabetes affects circulation and leg health, visit the CDC’s guide to peripheral artery disease and diabetes and the American Heart Association’s resource on PAD.

30. Swollen Gums

Swollen gums can be a direct result of elevated blood sugar levels. When glucose is high, it creates an environment that encourages bacterial growth in the mouth, leading to inflammation and infection of the gum tissue. This swelling is often similar to the discomfort experienced by people who wear braces, where the gums feel tender, puffy, and sore. In the case of high blood sugar, the inflammation may be persistent, and gums may bleed easily during brushing or flossing.

Ignoring gum swelling can lead to more severe oral health issues, such as periodontitis or tooth loss. People with diabetes or those suspecting high blood sugar should be particularly vigilant about their oral hygiene and seek regular dental checkups. Addressing gum inflammation early can help prevent more serious complications and may also signal the need to evaluate and manage blood sugar levels. For more information about the relationship between diabetes and gum health, visit the CDC’s diabetes and oral health resource and the American Dental Association’s diabetes and oral health page.

31. Trouble Sleeping

Trouble sleeping is a common but often overlooked symptom linked to high blood sugar. Fluctuations in glucose levels can disrupt the body’s natural sleep-wake cycle, leading to difficulty falling asleep, frequent awakenings, or restless nights. These disturbances can be similar to the jittery, unsettled feeling you might experience after consuming too much caffeine—your body feels wired and unable to relax, even when you’re tired. Elevated blood sugar can also increase nighttime urination, causing sleep interruptions and making it harder to get restorative rest.

Chronic sleep problems can, in turn, further destabilize blood sugar, creating a cycle of fatigue and poor metabolic control. If you notice that you are having ongoing trouble falling or staying asleep, it’s worth tracking your sleep patterns and discussing them with your healthcare provider, especially if you have other signs of high blood sugar. Identifying and addressing sleep issues early can help improve both your overall health and blood sugar management. For more on the connection between diabetes and sleep, visit the CDC’s guide to diabetes and sleep and the Sleep Foundation’s resource on diabetes and sleep.

32. Frequent Nighttime Urination

Frequent nighttime urination, known as nocturia, is a common symptom of elevated blood sugar levels. When glucose is high, the kidneys work overtime to filter and remove the excess sugar from the bloodstream, resulting in increased urine production. This process doesn’t stop at night, leading to multiple trips to the bathroom that can significantly disrupt sleep. People may find themselves waking up several times each night, often feeling tired and unrested the next day.

Nocturia not only affects sleep quality but can also be an early indicator of developing blood sugar problems, especially when it occurs alongside increased thirst or other diabetic symptoms. If you notice a sudden or gradual increase in nighttime bathroom visits, it’s important to track these changes and share them with your healthcare provider. Such patterns can provide valuable insight into your metabolic health. For more information about nocturia and its relationship to high blood sugar, visit the CDC’s resource on diabetes symptoms and the American Diabetes Association’s guide to diabetes symptoms.

33. Unexplained Bruising

Unexplained bruising can be a subtle but important clue that blood sugar levels are too high. Chronic hyperglycemia damages small blood vessels and reduces their strength, making them more fragile and prone to breaking. As a result, even minor bumps or seemingly insignificant pressure—such as bumping into furniture or carrying groceries—can cause bruises to form more easily and appear larger or darker than usual. This is similar to how people on blood thinners bruise more easily, but in this case, high sugar weakens the blood vessels themselves.

People with high blood sugar may notice that bruises appear without any clear cause or linger longer before fading. This increased fragility of blood vessels can also contribute to slow healing and higher risk of infections in the affected areas. If you observe frequent or unexplained bruising, especially when accompanied by other symptoms of elevated blood sugar, it’s important to mention this to your healthcare provider. For more information about the connection between diabetes and skin or blood vessel problems, visit the CDC’s diabetes skin complications resource and the American Diabetes Association’s skin complications page.

34. Poor Coordination

Poor coordination can be a sign that high blood sugar is impacting your nervous system. When glucose levels remain elevated over time, nerves—especially those in the extremities—can become damaged, a condition known as diabetic neuropathy. This nerve damage can disrupt the signals that control muscle movement and balance, leading to clumsiness, stumbling, or difficulty with tasks that require fine motor skills. The sensation is often similar to feeling “off balance” or awkward, as though your body isn’t quite responding the way you expect it to.

People may notice increased tripping, bumping into objects, or trouble with precise movements such as buttoning a shirt or picking up small items. Poor coordination can also increase the risk of falls and injuries, particularly in older adults. If you experience new or worsening balance issues, or if family members comment on increased clumsiness, it is important to seek medical evaluation. Early intervention can help manage symptoms and prevent further nerve damage. For additional information on diabetic neuropathy and its effects on movement, visit the CDC’s resource on diabetes and nerve damage and the National Institute of Diabetes and Digestive and Kidney Diseases’ overview.

35. Frequent Colds or Illness

Frequent colds or illnesses can be a sign that consistently high blood sugar is suppressing your immune system. Elevated glucose levels impair the body’s natural defenses, making it harder to fight off viruses and bacteria. This weakened immunity can lead to catching more colds, respiratory infections, or other illnesses than usual, much like the trend of falling ill repeatedly during the winter months when the immune system is already under stress. However, in the case of high blood sugar, this vulnerability can persist year-round.

If you notice that you are getting sick more often or that common illnesses linger longer than normal, it’s important to track these episodes and discuss them with your healthcare provider. Monitoring the frequency and duration of illnesses can help identify underlying blood sugar problems and prompt earlier intervention. Strengthening blood sugar control can improve immune function and reduce susceptibility to infections. For more on the relationship between diabetes and immune health, visit the CDC’s guide to preventing infections with diabetes and the American Diabetes Association’s infections and diabetes resource.

36. Persistent Bad Breath

Persistent bad breath, or halitosis, can be another sign of high blood sugar. Elevated glucose often leads to dry mouth due to dehydration, which reduces saliva production. Saliva helps cleanse the mouth and control bacterial growth, so when it’s lacking, bacteria multiply more easily, producing foul-smelling compounds. This type of bad breath is similar to the “morning breath” many people experience after a night’s sleep, when saliva flow naturally decreases, but with high blood sugar, it can linger throughout the day regardless of oral hygiene practices.

Chronic bad breath that doesn’t improve with regular brushing, flossing, or mouthwash may indicate an underlying metabolic issue rather than a simple dietary or hygiene problem. If you or those around you notice ongoing bad breath, especially if paired with other symptoms like dry mouth or gum disease, it’s important to consult both a dental professional and a healthcare provider for further evaluation. For more details on how diabetes and high blood sugar affect oral health and breath, visit the CDC’s diabetes and oral health page and the American Dental Association’s diabetes oral health resource.

37. Cloudy Urine

Cloudy urine can be a noticeable clue that blood sugar levels are too high. When excess glucose is excreted through the urine, it can alter its clarity, sometimes making it appear cloudy or milky rather than clear. This effect is similar to the appearance of cloudy lemonade—where what should be a transparent liquid becomes murky. Additionally, high blood sugar can increase the risk of urinary tract infections (UTIs), which also contribute to cloudiness due to the presence of white blood cells, bacteria, and other substances.

Persistent cloudy urine, especially if accompanied by a sweet or strong odor, burning sensation, or increased frequency of urination, should not be ignored. These symptoms could indicate both high blood sugar and a possible infection, both of which require prompt attention. Monitoring changes in your urine’s appearance can help with early identification of health issues. For further information on how diabetes affects urinary health, visit the CDC’s guide to diabetes and urinary tract infections and the American Diabetes Association’s resource on diabetes-related kidney and urinary complications.

38. Swollen Ankles or Feet

Swollen ankles or feet can indicate that high blood sugar is affecting your circulation and fluid balance. Chronic hyperglycemia damages blood vessels and impairs kidney function, making it more difficult for the body to efficiently remove excess fluids. As a result, fluid accumulates in the lower extremities, causing noticeable swelling. This sensation is comparable to the puffiness many people experience after a long flight, when sitting for extended periods hampers circulation and leads to fluid pooling in the ankles and feet.

If you observe persistent swelling—also called edema—in your feet or ankles, especially if it worsens throughout the day or is accompanied by other symptoms such as numbness, skin changes, or pain, it’s important to take note. Swelling can be a sign of worsening circulation, kidney involvement, or even heart problems, all of which are more common in people with uncontrolled blood sugar. Regularly checking your feet and ankles for changes in size, shape, or texture can help with early identification of complications. For more details on diabetes, circulation, and swelling, see the CDC’s skin complications page and the American Diabetes Association’s resource on foot complications.

39. Change in Appetite

A noticeable change in appetite can be a sign that your blood sugar levels are fluctuating. Elevated glucose disrupts the normal hormonal signals that regulate hunger and fullness, often causing increased or unpredictable cravings. For example, you might find yourself feeling hungrier than usual after eating sweets or refined carbohydrates—a cycle similar to craving more food shortly after consuming a sugary snack. This is because high blood sugar can trigger a spike and then a rapid drop in glucose, confusing the body’s natural cues and leading to increased hunger or, in some cases, a sudden lack of appetite.

Being aware of these shifts is important, as persistent changes in how much or how often you want to eat could be an early warning sign of blood sugar imbalance. If you notice that your appetite is increasing, becoming insatiable, or that you’re losing interest in food without obvious reason, it’s important to track these patterns and discuss them with your healthcare provider. For more information on how diabetes affects appetite and hunger cues, visit the CDC’s diabetes symptoms page and the American Diabetes Association’s list of diabetes symptoms.

40. Numbness in Feet

Numbness in the feet is a common indicator of diabetic neuropathy, a condition caused by prolonged high blood sugar damaging the nerves. This numbness often starts gradually, beginning in the toes and spreading up the foot, and can feel similar to the sensation you experience when your feet “fall asleep” after sitting in one position for too long—except in this case, the sensation doesn’t easily go away. Over time, the loss of feeling can make it difficult to sense pain, temperature, or injuries, increasing the risk for wounds, infections, and complications.

If you have diabetes or suspect high blood sugar, it’s critical to regularly inspect your feet for cuts, blisters, or sores you might not feel due to numbness. Early detection of numbness and foot injuries can help prevent serious complications, including ulcers and even amputation. If you notice persistent numbness or tingling in your feet, report it to your healthcare provider as soon as possible. For more information about diabetic neuropathy and foot care, visit the CDC’s resource on diabetes and nerve damage and the American Diabetes Association’s guide to diabetic neuropathy.

41. Red, Swollen Gums

Red, swollen gums are a frequent oral health issue among those with consistently high blood sugar. Elevated glucose creates an environment in which harmful bacteria can thrive, leading to inflammation of the gum tissue—a condition very similar to gingivitis. People may notice their gums appear darker red, puffier, or bleed easily when brushing or flossing. This inflammation can be persistent and is often resistant to standard oral hygiene routines alone, signaling a deeper metabolic imbalance.

Unchecked gum inflammation can progress to more severe periodontal disease, resulting in gum recession, tooth loss, and further complications. If you observe that your gums are frequently red, swollen, or tender, it’s important to monitor your oral health closely and schedule regular dental checkups. Early detection and intervention are key to preventing long-term dental problems and can also help in the early identification of high blood sugar or diabetes. For more information about the link between gum health and blood sugar, visit the CDC’s page on diabetes and oral health and the American Dental Association’s diabetes and gum disease overview.

42. Increased Heart Rate

An increased heart rate is another sign that may accompany high blood sugar episodes. When glucose levels are elevated, the body responds by releasing stress hormones such as adrenaline and cortisol. These hormones are intended to help manage the metabolic stress, but they also stimulate the heart, causing it to beat faster—similar to the sensation you might experience during moments of anxiety or nervousness. This rapid heartbeat can occur even when you are at rest and may be accompanied by palpitations or a fluttering sensation in the chest.

Persistent or unexplained increases in heart rate should not be ignored, especially if you notice this symptom alongside others like thirst, fatigue, or frequent urination. Monitoring your pulse regularly can help you and your healthcare provider identify patterns and determine whether further evaluation or intervention is needed. Chronic increased heart rate can strain the cardiovascular system, particularly in people with diabetes, raising the risk for heart disease. For more information about the connection between blood sugar, stress hormones, and heart rate, visit the CDC’s guide to heart disease and diabetes and the American Heart Association’s overview of diabetes and heart health.

43. Loss of Interest in Usual Activities

Loss of interest in activities that once brought joy or engagement can be a subtle but significant sign of high blood sugar. Fluctuating glucose levels can disrupt both mood and energy levels, leading to a sense of apathy or indifference that closely resembles depressive symptoms. You may find yourself withdrawing from hobbies, social events, or even daily responsibilities—not because of a conscious choice, but due to persistent fatigue and lack of mental or physical drive. This experience can feel like a heavy cloud, sapping motivation and pleasure from things you previously enjoyed.

If you notice a marked decrease in your usual enthusiasm or motivation, especially when coupled with other symptoms like fatigue, irritability, or trouble concentrating, it’s important to take these signs seriously. Loss of interest can be tied to both the physiological effects of high blood sugar and the emotional burden it brings. Monitoring your mood and seeking support from a healthcare provider is crucial in addressing both physical and mental health. For more on the relationship between diabetes and mood changes, visit the CDC’s diabetes and mental health resource and the American Diabetes Association’s guide to mental health.

44. Vision Fluctuations

Vision fluctuations are a common yet often confusing sign of high blood sugar. Rapid changes in glucose levels can alter the shape and fluid balance of the eye’s lens, causing your vision to shift from clear to blurry and back again in a short period. This can feel similar to frequently adjusting a pair of glasses that never quite seem to provide the right focus. These vision changes may occur throughout the day, making it difficult to read, drive, or carry out other daily tasks that require clear eyesight.

Unlike permanent vision loss, these fluctuations are typically reversible once blood sugar is brought under control. However, persistent or severe instability in your vision should not be ignored, as it may also signal more serious complications such as diabetic retinopathy. If you notice your eyesight varying frequently or unpredictably, keep a record of these changes and share them with your healthcare provider. Early detection is essential for preventing long-term damage. For more information about the impact of blood sugar on vision, visit the American Academy of Ophthalmology’s diabetes and vision resource and the CDC’s guide to diabetes and eye health.

45. Skin Infections

Skin infections are a frequent complication in individuals with high blood sugar. Elevated glucose levels create an ideal environment for bacteria to thrive, weakening the skin’s natural defenses and slowing down the body’s healing response. Common infections include boils, abscesses, cellulitis (a painful, red swelling of the skin), and even more serious conditions if left untreated. For example, a seemingly minor cut or scrape may develop into a larger, pus-filled area or become red, swollen, and tender—signs that a bacterial infection is taking hold.

Prompt treatment of skin infections is crucial, especially for those with diabetes or suspected high blood sugar, as these infections can quickly worsen and spread. Ignoring skin changes or delaying care raises the risk of complications, including deeper tissue infection or even sepsis. If you notice recurring or unusually severe skin infections, seek medical attention right away. For more information about diabetes and skin health, visit the CDC’s skin complications and diabetes resource and the American Diabetes Association’s page on skin complications.

46. Decreased Libido

Decreased libido, or reduced interest in sexual activity, can be a significant yet often unspoken result of high blood sugar. Elevated glucose levels can disrupt hormonal balance and impair blood flow, both of which are crucial for maintaining sexual desire and function. This effect is similar to the way chronic stress or fatigue can dampen sex drive, but in this case, it’s driven by persistent metabolic changes rather than psychological factors alone. High blood sugar can also contribute to nerve damage (neuropathy) and emotional symptoms such as depression or anxiety, all of which further decrease sexual motivation.

If you notice a lasting decline in your interest in sex—especially if it’s accompanied by other symptoms like erectile dysfunction, vaginal dryness, or mood changes—it’s important to discuss these changes with your healthcare provider. Addressing blood sugar control can often improve libido and overall quality of life. For more information about the impact of diabetes on sexual health, visit the CDC’s resource on diabetes and sexual health and the American Diabetes Association’s sexual health guide for men and for women.

47. Trouble with Wound Healing on Feet

Trouble with wound healing on the feet is a serious concern for individuals with high blood sugar. Chronic hyperglycemia damages blood vessels and nerves in the lower extremities, leading to reduced circulation and sensation. As a result, even minor cuts, blisters, or sores on the feet may heal very slowly or not at all. A common example is the development of a diabetic foot ulcer—a persistent open sore that can become infected and, if untreated, may lead to severe complications such as gangrene or amputation.

People with diabetes or elevated blood sugar may not feel injuries on their feet due to neuropathy, increasing the risk of unnoticed wounds becoming worse. Regularly checking your feet for any signs of redness, swelling, sores, or changes in skin color is essential for early detection and prevention of complications. If you notice any wounds that do not improve or show signs of infection, seek medical attention promptly. For more information on diabetic foot care and wound healing, visit the CDC’s foot health and diabetes resource and the American Diabetes Association’s guide to foot complications.

48. Increased Sweating

Increased sweating can be a sign of blood sugar imbalances, particularly when levels fluctuate rapidly or remain consistently high. Elevated glucose can disrupt the autonomic nervous system, which controls involuntary functions like sweating. This disruption may trigger the sweat glands to become overactive, leading to episodes of excessive perspiration even when you’re not physically exerting yourself or in a hot environment. The sensation can resemble hot flashes, where sudden waves of heat and sweating occur unexpectedly and can be uncomfortable or embarrassing.

These changes in sweating may be most noticeable at night (night sweats) or during periods of stress and can be accompanied by other symptoms such as anxiety, palpitations, or fatigue. Noting any new or unexplained patterns of increased sweating is important, especially if they coincide with other signs of blood sugar problems. Tracking these episodes can help you and your healthcare provider identify underlying metabolic issues. For more information on how diabetes and blood sugar imbalances affect sweating and the nervous system, visit the CDC’s guide to diabetes and nerve damage and the American Diabetes Association’s resource on diabetic neuropathy.

49. Loss of Hair on Legs

Loss of hair on the legs can be a subtle but significant sign of poor circulation resulting from high blood sugar. Chronic hyperglycemia damages small blood vessels, reducing blood flow to the skin and hair follicles. Without adequate nourishment and oxygen, hair growth slows or stops, leading to thinning or patchy hair loss. This effect can be similar to the gradual hair thinning many people experience with aging, but in the case of high blood sugar, it often appears more abruptly and is concentrated in specific areas, such as the shins or lower legs.

If you notice patchy or sudden hair loss on your legs—especially when accompanied by other symptoms like cold skin, slow-healing wounds, or changes in skin color—it’s important to bring this to the attention of your healthcare provider. Patchy hair loss may indicate underlying peripheral artery disease (PAD) or other circulatory problems associated with diabetes. Early detection can help prevent more serious complications. For more information about diabetes, circulation, and skin changes, visit the CDC’s page on peripheral artery disease and the American Diabetes Association’s skin complications resource.

50. Unusual Sweet Taste in Mouth

An unusual sweet taste in the mouth can be a distinct indicator of elevated blood sugar levels. When glucose circulates at higher concentrations in the blood, some of it can diffuse into the saliva, altering your sense of taste. This sensation can feel as though you have a coating of sugar on your tongue, similar to the lingering sweetness after eating candy or sugary foods, but it occurs without recent consumption of sweets. For some, the taste may persist throughout the day and is not easily relieved by brushing or rinsing.

A persistent sweet taste in the mouth should not be ignored, especially if it is accompanied by other symptoms like excessive thirst, frequent urination, or unexplained fatigue. This change may be an early sign of diabetes or poorly controlled blood sugar and warrants a discussion with your healthcare provider. Early detection can help prevent complications and ensure proper management. For more information on how diabetes and high blood sugar can affect taste and oral health, visit the CDC’s diabetes and oral health resource and the American Dental Association’s diabetes and oral health page.

Conclusion

Recognizing the signs of high blood sugar is crucial for preventing serious health complications, as symptoms often develop subtly and may go unnoticed until damage has occurred. Early detection can make a significant difference in managing and reversing the risks associated with hyperglycemia. Practical steps include regular blood sugar screenings, paying attention to persistent or unusual symptoms, and seeking timely advice from healthcare professionals. Don’t hesitate to act if you notice any warning signs—early intervention saves lives. For more on diabetes prevention and management, visit the CDC’s diabetes prevention page and the American Diabetes Association’s resource center.

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