 In the brain , AVMs occasionally exert pressure , leading to headaches . They may also increase the risk of seizures , as would any abnormal tissue in the brain . Finally , hemorrhage from an AVM may lead to intracerebral hemorrhage ( bleeding into the brain ) , which causes any of the symptoms of stroke such as weakness in part of the body or difficulty speaking . If the bleeding occurs into the subarachnoid space ( subarachnoid hemorrhage ) , there is usually a severe , sudden headache and decreased level of consciousness and often weakness in part of the body . 
