Strokes occur when blood supply to the brain is blocked or blood vessels in the brain rupture.
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A stroke occurs when blood flow to a part of the brain is cut off or drastically reduced. Brain cells begin to die when they are deprived of oxygen and glucose. Permanent brain damage or death is possible if a stroke is not caught early.
There are two types of strokes. Nearly 80% of incidences are an ischemic stroke. Like a heart attack, clots form in blood vessels and impede blood flow to the brain. The second type is a hemorrhagic stroke, or brain bleeding, which is fatal nearly 40% of the time. In a hemorrhagic stroke, blood vessels break, leak into brain tissue and damage cells. High blood pressure and brain aneurysms are the most common cause of hemorrhagic stroke.