Viral Infections Cause Brain Fog
That cloudy feeling you experience when you’re sick isn’t always caused by being tired from your body fighting against infection. Viral infections including upper respiratory infections, Type 1 and 2 herpes, HIV, and other illnesses cause brain swelling that results in brain fog. Illnesses caused by bacteria (like Staph infection), insect bites (like West Nile Virus), or rabies also cause encephalitis. While a little swelling is expected, you should see your doctor if you experience a sudden, severe headache, a high fever, or other neurological symptoms. There could be something seriously wrong.