All strokes damage the brain by disrupting circulation, but strokes come in multiple varieties. Because different parts of the brain are specialized to perform specific functions, symptoms produced by strokes vary according to what part of the brain was injured. In one patient the symptom might be weakness on one side of the body. In another it might be a partial loss of vision. In still another, a loss of speech. And symptoms can vary in intensity from mild to severe according to how large the area of damage is and whether it occurred in a pivotal location.
Strokes can also vary according to another fundamental difference — whether they involve a blocked blood vessel or a hemorrhage. Most strokes are due to the former in which brain-tissue damaged by lack of circulation is called an infarction. But 10-15% of strokes involve bleeding from ruptured blood vessels within the brain tissue, and while it’s bad enough to have an infarction, hemorrhagic strokes (intracerebral hemorrhages) can be even more devastating.
One prominent figure with spontaneous intracerebral hemorrhage is Ariel Sharon, whose hemorrhagic stroke occurred while he was still prime...
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