What is a Encephalitis ?

Encephalitis may cause 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.

Encephalitis is an uncommon but potentially life-threatening inflammation of the brain that can occur in people of all ages.

  • children
  • older adults
  • individuals with weakened immune systems
  • people who live in areas where mosquitoes and ticks are common

Risk Factor

  • older adults
  • children under the age of 1
  • people with weak immune systems


  • High fever
  • Severe headache
  • Stiff neck and back
  • Photophobia 
  • Sonophobia 
  • Vomiting
  • Drowsiness and confusion
  • Seizures
  • Behavioral changes
  • Muscle weakness
  • Partial paralysis
  • Loss of consciousness