Encephalitis (en-sef-uh-LIE-tis) is inflammation of the brain. There are several causes, but the most common is a viral infection. Encephalitis often causes only mild flu-like signs and symptoms, such as a fever or headache, or no symptoms at all. Sometimes the flu-like symptoms are more severe.

Symptoms of a brain abscess
headache,which is often severe and located in a single section of the head and cannot be relieved with painkillers.
changes in mental state, such as confusion or irritability.
problems with nerve function, such as muscle weakness, slurred speech or paralysis on one side of the body.