Subarachnoid Hemorrhage: When a Brain Aneurysm Bleeds
Spontaneous subarachnoid (pronounced sub-uh-RACK-noid) hemorrhage is rightfully the most feared cause of sudden headache. Usually due to rupture of aneurysms (abnormal, balloon-like outpouchings of arteries) located near the base of the brain, subarachnoid hemorrhages involve bleeding into the space between the brain and its surrounding membrane, known as the meninges. A traumatic blow to the head can also cause subarachnoid hemorrhage, but this is a completely unrelated process and is not the subject of this essay.
About 10% of people with spontaneous subarachnoid hemorrhages die before they even get to a hospital and over a third die within the first
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