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Stroke (“brain attack”) is a disease of the blood vessels in and around the brain. It occurs when part of the brain does not receive enough blood to function normally and the cells die (infarction), or when a blood vessel ruptures (hemorrhagic stroke). Infarction is more common than hemorrhage and has a number of causes; for example, a vessel (artery) supplying blood to the brain can become blocked by a fatty deposit (plaque), which can form clots and send pieces into vessels further in the brain, or these arteries become thickened or hardened, narrowing the space where the blood flows (atherosclerosis). In addition, clots can arise in the heart and travel to the brain