Encephalitis: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Encephalitis?
A neurologist (a doctor who treats brain and nerve conditions) and an infectious disease doctor (a doctor who treats infections) usually care for encephalitis. Most people need treatment in a hospital. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What is encephalitis?
Encephalitis is inflammation, or swelling, of the brain. An infection or another medical condition that affects the brain can set off the immune system, the body's defense system. This can cause swelling. In extreme cases, it can lead to brain damage, stroke, or even death.
Anyone can get it. It is rare. Very young children and older adults are more likely to have a severe case.
Symptoms
Symptoms can vary a lot. Many people have no symptoms. Others have mild flu-like symptoms, such as:
- A fever that is not very high
- Tiredness
- A mild headache
- Body aches
A more serious case can also cause a stiff neck, vomiting, behavior changes, drowsiness, and confusion. In babies, watch for fever, unusual sleepiness, poor feeding, vomiting, body stiffness, and unusual crying. A bulging soft spot on top of the head is another sign.
Some symptoms are emergencies. Call 911 or go to the emergency room if you have a sudden fever or other symptoms of encephalitis. Warning signs include loss of consciousness, a seizure, a severe headache, muscle weakness or paralysis, or a sudden change in thinking. Memory loss and poor judgment are examples.
Causes and who gets it
There are two main types. The infectious type is usually caused by a virus. These include herpes viruses such as herpes simplex, and viruses spread by tick or mosquito bites, such as West Nile virus. Bacteria, fungi, and parasites can also cause it, but this is not common.
The autoimmune type happens when the immune system mistakenly attacks healthy brain cells. Certain cancers, noncancerous tumors, and infections can trigger it. Sometimes the cause is not known.
You are more likely to get it if you have a weakened immune system, are a young child or older adult, or live where ticks and mosquitoes carry the viruses that cause it. Some forms are contagious. Good hygiene, vaccines, and avoiding mosquito and tick bites can help prevent the infectious forms.
How doctors diagnose it
A doctor will do a physical exam and ask about your symptoms and health history. A neurologic exam checks strength, senses, vision, and thinking.
Other tests may include:
- A CT scan or MRI, which are pictures of the brain.
- An EEG, which uses small sensors to measure brain activity.
- Blood tests.
- A lumbar puncture, also called a spinal tap. A needle in the lower back removes a small amount of spinal fluid to test for infection.
Treatment
Most people need treatment in the hospital. Treatment depends on the cause. It may include antiviral medicines, antibiotics, corticosteroids (medicines that reduce swelling), and others. Antiviral medicines can treat encephalitis caused by a virus. But most of these viruses have no specific treatment.
The autoimmune type is treated with immunosuppressant medicines, which calm the immune system. Doctors may also check for a hidden tumor. Other medicines can help with symptoms, such as medicines that stop or prevent seizures.
For some types, there is no medicine. Rest, good nutrition, and fluids can still help your body fight the infection and ease symptoms. After the illness is under control, some people need physical, speech, or job-skills (occupational) therapy.
The outcome varies. Some cases are mild and short, and the person fully recovers. Other cases are severe, and lasting problems or death are possible.
When to see a doctor
Call 911 or go to the emergency room if you or your child has a sudden fever or other symptoms of encephalitis. Warning signs include loss of consciousness, a seizure, a severe headache, muscle weakness or paralysis, or a sudden change in thinking. It can start suddenly and get worse fast.
If you or your child has any symptoms of encephalitis, get medical care right away.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. After a hospital stay, such a doctor can help with follow-up visits and coordinate therapy and specialist care. Sudden or severe symptoms still need emergency care.
Common questions
Is encephalitis an emergency?
Yes, it can be. It can start suddenly and get worse fast. Anyone who may have it should contact a doctor or go to the hospital right away. Call 911 for loss of consciousness, a seizure, or a sudden change in thinking.
Can encephalitis be prevented?
Some types can be. Wash your hands often. Do not share food, drinks, or utensils. Vaccines for viruses that cause it also help. Insect repellent and clothes that cover your arms and legs protect you from mosquito and tick bites.
Is encephalitis contagious?
Some forms are. They can spread through contact with saliva, nose fluid, or stool. People who share a home, day care, or classroom with a sick person can catch them.
Do people recover from encephalitis?
Many people with mild cases do. They can recover fully, but it may take several months. Severe cases can cause lasting problems with hearing, memory, muscle control, speech, or vision. Death is possible.
Sources
- MedlinePlus - Encephalitis
- MedlinePlus - Encephalitis (Medical Encyclopedia)
- National Institute of Neurological Disorders and Stroke - Encephalitis
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
