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A stroke is an injury to the brain caused when the brain’s blood supply is interrupted or greatly reduced. The brain is deprived of oxygen and nutrients, and brain cells begin to die within minutes. For that reason, a stroke is considered a medical emergency and requires prompt diagnosis and treatment.

Topics in this section include stroke basics; types of strokes, symptoms, preventing and minimizing the risk of strokes, recognizing a stroke and responding quickly, caregiving a person who’s had a stroke:

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