Symptoms depend on which part of the brain is being attacked. These are the most common symptoms of encephalitis: Headache. Mild flu-like symptoms (aches, fatigue, slight fever)

How do you rule out encephalitis?

Samples of blood, urine or excretions from the back of the throat can be tested for viruses or other infectious agents. Electroencephalogram (EEG). Electrodes affixed to your scalp record the brain's electrical activity. Certain abnormal patterns may indicate a diagnosis of encephalitis.

How long does encephalitis headache last?

In most cases, people with very mild encephalitis or meningitis can make a full recovery, although the process may be slow. Individuals who experience only headache, fever, and stiff neck may recover in 2-4 weeks.