The two main types of strokes, ischemic and hemorrhagic, affect blood vessels in the brain. Ischemic strokes account for 80-85% of all strokes and occur when a blood vessel in the brain is blocked, similar to a heart attack. A hemorrhagic stroke occurs when a blood vessel in the brain actually bursts and leaks. Hemorrhagic strokes are more serious. The difference between these two stroke types is important in determining the treatment that will help the patient. A “third” type of stroke considered by some researchers to be a subtype of ischemic stroke is a TIA or transient ischemic attack (also called a mini-stroke).
An ischemic stroke occurs when blood vessels become too narrow or clogged so they can’t get enough blood to flow, provide oxygen, and keep brain cells alive.
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