Hemorrhagic stroke, a type of stroke that can happen when a weakened blood vessel ruptures and causes bleeding in the brain, makes up 15 percent of all stroke cases. One condition that can bring about this kind of stroke is an arteriovenous malformation (AVM) in the brain.
An AVM is a tangle of deformed arteries and veins, and an AVM can cause problems for organs because it prevents blood from circulating properly.
For most people with AVMs, symptoms don’t arise until the AVM ruptures and causes critical damage to the brain or spinal cord. Hemorrhage from an AVM, especially if it happens in the brain, can be devastating, resulting in anything from an extremely severe headache to a stroke or even death. Approximately 2 percent of all hemorrhagic strokes are due to AVMs.

By Juhie Bhatia
Medically Reviewed by Lindsey Marcellin, MD, MPH