Brain Abscess: Causes, Symptoms, and Treatment
Medically reviewed by Achuta Uppu, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Brain Abscess?
A neurosurgeon (a brain surgeon) and an infectious disease doctor usually treat a brain abscess together. A neurologist (a brain and nerve doctor) may help with seizures and recovery. 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 brain abscess?
A brain abscess is a collection of pus, immune cells, and other material in the brain, caused by a bacterial or fungal infection. Swelling and irritation develop in the infected area. Infected brain cells, white blood cells, and live and dead germs collect in one spot. Tissue then forms around this area and creates a mass.
A brain abscess is a medical emergency. Pressure inside the skull can rise high enough to become life threatening.
Symptoms
Symptoms may develop slowly over several weeks or come on suddenly. Headache is the most common symptom. Others include:
- Fever and chills.
- Changes in mental status, such as confusion, slow thinking, or sleepiness.
- Seizures, which are sudden bursts of uncontrolled electrical activity in the brain.
- Weakness or loss of muscle function, usually on one side.
- Nausea and vomiting.
- Vision changes, language problems, or a stiff neck.
Causes and who gets it
Germs can reach the brain through the blood. They can also enter directly during brain surgery or after a face injury. Abscesses also grow from infections in nearby areas such as the ear, teeth, or sinuses. Some come from far-off sites such as the lungs or heart. The source is often not found. When it is found, it is most often a lung infection. Sinus infections cause a large share of cases.
Things that raise the chance of a brain abscess include a weak immune system, long-term disease such as cancer, drugs that suppress immunity such as corticosteroids or chemotherapy, and a heart defect present at birth. Cases are most common in adult men aged 30 or younger and in children aged 4 to 7.
How doctors diagnose it
A brain and nerve exam usually shows signs of raised pressure inside the skull. It also shows problems with brain function. Tests may include blood cultures, a complete blood count, a chest x-ray, and an EEG, a test that records the brain's electrical activity. A head CT scan or an MRI of the head make detailed pictures of the brain. These are the main tests used. A needle biopsy is usually done to find the cause of the infection.
Treatment
A brain abscess needs hospital care. Antibiotics rather than surgery may be chosen for a small abscess under about 2 cm, an abscess deep in the brain, several abscesses, or an abscess with meningitis. You may get several antibiotics at once, and antifungal drugs if a fungus is likely.
Surgery is needed if pressure keeps rising, the abscess does not shrink with medicine, it contains gas, it might rupture, or it is larger than about 2 cm. Surgery opens the skull and drains the abscess. The drained fluid is tested to pick the right medicine. Steroids and diuretics, drugs that cut fluid in the body, may lower brain swelling.
When to see a doctor
Go to a hospital emergency room or call 911 right away if you have symptoms of a brain abscess. Watch for headache with fever, confusion, seizure, or weakness on one side. If untreated, a brain abscess is almost always deadly, and the earlier treatment is received, the better.
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. Do not wait for a clinic visit if you have symptoms of a brain abscess; go to the emergency room. After hospital care, they can manage follow-up, watch for the infection's return, and coordinate the neurologist and surgeon.
Common questions
Can a brain abscess be cured?
It is treated with antibiotics, sometimes with surgery, but it is very serious. With treatment, the death rate is about 10% to 30%. The earlier treatment is received, the better.
What causes a brain abscess?
Most come from bacteria or fungi. Germs reach the brain through the blood or directly from nearby infections in the ear, teeth, or sinuses, or after surgery or trauma.
Who is most at risk?
People with weakened immune systems, chronic diseases such as cancer, or congenital heart disease, and people taking medicines that suppress immunity. Cases are most common in adult men aged 30 or younger and in children aged 4 to 7.
Can it come back?
Yes, the infection can return after treatment. Some people also have long-term brain or nerve damage after the abscess or its surgery, and seizures are a possible complication.
Sources
- MedlinePlus - Brain abscess: MedlinePlus Medical Encyclopedia
- StatPearls (NCBI Bookshelf) - Brain Abscess
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.
