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What causes a brain hemorrhage?
The most common cause of a brain hemorrhage is elevated blood pressure. Over time, elevated blood pressure can weaken arterial walls and lead to rupture. When this occurs, blood collects in the brain leading to symptoms of a stroke. Other causes of hemorrhage include aneurysm -- a weak spot in the wall of an artery -- which then balloons out and may break open. Arteriovenous malformations (AVM) are abnormal connections between arteries and veins and are usually present from birth and can cause brain hemorrhage later in life. In some cases, people with cancer who develop distant spread of their original cancer to their brain (metastatic disease) can develop brain hemorrhages in the areas of brain where the cancer has spread. In elderly individuals, amyloid protein deposits along the blood vessels can cause the vessel wall to weaken leading to a hemorrhagic stroke. Cocaine or drug abuse can weaken blood vessels and lead to bleeding in the brain. Some prescription drugs can also increase the risk of brain hemorrhage.