Cerebral Arteriovenous Malformation: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Cerebral Arteriovenous Malformation?
A neurologist often helps diagnose and monitor a brain AVM. A neurosurgeon usually handles treatment. Radiation oncologists may also be involved if radiosurgery is used. 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 it is
A cerebral arteriovenous malformation, often called a brain AVM, is a tangle of abnormal blood vessels in the brain. In a healthy brain, blood flows from arteries through capillaries into veins. With an AVM, the arteries connect straight to the veins, and the capillaries in between are missing. Some AVMs never cause problems, but they can rupture and bleed.
Symptoms
Many people with a brain AVM have no symptoms. Symptoms can include headaches, seizures, muscle weakness or numbness, or trouble speaking or seeing. A rupture causes bleeding in the brain, with signs such as a sudden severe headache, vomiting, a stiff neck, or passing out. These need emergency care right away.
Causes and who gets it
Doctors do not know what causes brain AVMs, but most people are born with them during brain development before birth. They are not usually inherited. Brain AVMs are rare, affecting less than 1 percent of people, and are slightly more common in males and in people aged 20 to 40.
How doctors diagnose it
Doctors often find a brain AVM using imaging scans such as MRI, CT, and cerebral angiography, which uses dye to show blood vessels in detail. These tests show the size and location of the AVM.
Treatment
Treatment depends on the size and location of the AVM and whether it has bled. Options include surgery to remove it, embolization, which blocks blood flow to it, and radiosurgery, which uses focused radiation to shrink it. Some AVMs are watched with regular scans if treatment is riskier than the AVM itself.
When to see a doctor
See a doctor if you have ongoing headaches, seizures, muscle weakness, numbness, or changes in vision or speech. If someone has a sudden severe headache, vomiting, a stiff neck, or passes out, call 911 right away.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee, while a concierge doctor usually charges more and often works alongside insurance. Either type can evaluate symptoms, order brain scans, and refer a patient to a neurologist or neurosurgeon, then help with follow-up and coordinating care between specialists.
Common questions
Can a brain AVM go away on its own?
Most brain AVMs do not go away on their own, though some may shrink over time. Doctors usually monitor it with regular imaging if treatment is not needed right away.
Is a brain AVM the same as an aneurysm?
No. An aneurysm is a weak, bulging spot in a blood vessel wall, while an AVM is a tangle of arteries and veins connected in the wrong way. Both can cause bleeding in the brain.
Can I exercise if I have a brain AVM?
Many people with a brain AVM can be active, but some activities may raise the risk of bleeding. Ask your neurologist or neurosurgeon which activities are safe, since the answer depends on the size and location of the AVM.
What happens if a brain AVM bleeds?
Bleeding from an AVM can cause stroke-like symptoms such as weakness, trouble speaking, or loss of consciousness, and is a medical emergency. Not all AVMs bleed, but once one has bled, doctors often recommend treatment to lower the chance of it happening again.
Sources
- MedlinePlus - Arteriovenous Malformations
- NIH Genetic and Rare Diseases Information Center - Cerebral arteriovenous malformation
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.
