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What is a stroke?

A stroke occurs when the flow of oxygenated blood to the brain is suddenly interrupted. There are two types of stroke: 1) Ischemic stroke which is caused by the buildup of fatty deposits (plaque) in a brain artery, or by a blood clot which blocks blood flow in a brain artery; or 2) Hemorrhagic stroke which is caused by a sudden rupture of an artery leading to the brain.