High Blood Pressure: Stroke
High blood pressure is the most important risk factor for stroke. Very high pressure can cause a break in a weakened blood vessel, which then bleeds in the brain. This can cause a stroke. If a blood clot blocks one of the narrowed arteries, it can also cause a stroke.

source: http://www.nhlbi.nih.gov/hbp/hbp/effect/brain.htm

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