Hemorrhagic stroke is caused by a burst artery that spills blood into part of the brain. In a healthy brain, the blood remains in the arteries and does not come into contact with neurons. When blood bursts into the brain during a hemorrhagic stroke, the normal flow of blood to the brain is upset, and the blood interferes with the normal chemical balance that neurons need to function.Poor blood clotting also can increase the risk of bleeding in a hemorrhagic stroke. Poor blood clotting may be caused by blood disorders or medications that decrease clotting. Another cause of hemorrhagic stroke is abnormalities in the structure of blood vessels that form during brain development.
https://www.nichd.nih.gov/health/topics/stroke/conditioninfo/causes
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