What are the symptoms of an arteriovenous malformation?

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It is quite possible that you may not know you have an AVM (arteriovenous malformation) until you experience symptoms. They can include headaches or seizures. Patients may have localized pain in the head due to increased blood flow around an AVM. A small percentage may have difficulty with movement, speech or vision.

More than 50 percent of patients with an AVM have an intracranial hemorrhage. AVMs are usually congenital, meaning someone you are born with it. But they’re usually not hereditary.

With AVMs, a tangle of blood vessels in the brain or on its surface bypasses normal brain tissue and directly diverts blood from the arteries to the veins.