Anemia is a lack of red blood cells in your blood or a reduced ability of your blood to carry oxygen. Common signs of anemia are a weakness, shortness of breath, and fatigue. A person who is anemic tends to look extremely pale.
People who are anemic tend to be deficient in iron. A lack of nutrients and a lack of a balanced diet are major factors in getting dark circles under your eyes. In addition, women who are pregnant or on their period are lacking in iron, which allows veins under the eyes to become more visible. Because of that, many pregnant women are given iron supplements.