ENCEPHALITIS SYMPTOMS

The symptoms of encephalitis range from very mild to very severe and may include:

• headache
• fever
• lethargy (sleepiness, decreased alertness, and fatigue)
• malaise
• nausea and vomiting
• visual disturbances
• tremor
• decreased consciousness (drowsiness, confusion, delirium, and unconsciousness)
• stiff neck
• seizures

Symptoms may progress rapidly, changing from mild to severe within several days or even several hours.