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Encephalitis

Last Updated: July 3, 2026

Key Points

  • Brain inflammation (swelling)
  • Uncommon but serious condition
  • Requires urgent hospital treatment
  • Can be life-threatening
  • Very young and very old are most at risk

Overview

Encephalitis is a rare but serious condition where the brain becomes inflamed or swollen. It needs immediate medical attention in a hospital as it can be life-threatening. Anyone can get it, but infants and older adults face the highest risk. It's often caused by viral infections, like those that cause cold sores or chickenpox, spreading to the brain. Sometimes, the immune system mistakenly attacks the brain. Less commonly, bacteria or fungi can be the cause. Some types are spread by insects like mosquitoes or ticks. Treatment is given in a hospital and depends on the cause. It might involve antiviral drugs, steroids, or medicines to control the immune system, along with supportive care for breathing and seizures. Early treatment is crucial for better outcomes.

Signs and Symptoms

  • Flu-like symptoms (high temperature, headache)
  • Confusion or disorientation
  • Seizures or fits
  • Changes in personality and behavior
  • Difficulty speaking
  • Weakness or loss of movement in parts of the body
  • Loss of consciousness

Things That Increase the Risk

  • Very young age
  • Very old age
  • Viral infections (e.g., herpes simplex, chickenpox)
  • Problems with the immune system
  • Exposure to mosquitoes (e.g., Japanese encephalitis)
  • Exposure to ticks (e.g., tick-borne encephalitis)
  • Exposure to infected mammals (e.g., rabies)

Diagnosis

  • Review of symptoms and medical history
  • Physical examination
  • Brain imaging (MRI, CT scans)
  • Spinal fluid analysis (lumbar puncture)
  • Blood tests to identify cause

Treatment & Management

  • Antiviral medicines
  • Steroid injections
  • Treatments to control the immune system
  • Antibiotics or antifungal medicines
  • Painkillers for discomfort or fever
  • Medicine to control seizures or fits
  • Breathing support (oxygen, ventilator)

Prevention

  • MMR vaccination for children
  • Japanese encephalitis vaccine for travelers to at-risk areas
  • Tick-borne encephalitis vaccine for travelers to certain regions
  • Rabies vaccination for travelers to high-risk areas
  • Consult a doctor about vaccination status

Available Treatments

Explore our range of treatment options for Encephalitis:

Encephalitis Treatment

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Contents

Quick Info

Affects

Brain

Prevalence

Uncommon

Diagnosis

Symptom review, imaging, lab tests

Treatment

Hospital care, specific medications

Medically Reviewed

Dr. Vijay Bhat

Dr. Vijay Bhat

Orthopedic Surgeon · Apollo Hospitals, Chennai

Reviewed on July 3, 2026

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