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The subarachnoid space is the area between the brain and the delicate tissues surrounding it. A subarachnoid hemorrhage is a stroke that occurs when blood collects in this area. It is a life-threatening emergency and requires immediate medical attention. Subarachnoid hemorrhage accounts for more than a quarter of potential years of life lost to stroke for people under the age of 65.

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1. Most Common Causes

The most common cause of subarachnoid hemorrhage is head trauma, often resulting from falls in older people and motor vehicle accidents in younger people. A hemorrhagic stroke occurring somewhere else in the brain can also cause this event, if the blood leaks into the subarachnoid space.

Fall Head Injury Goodboy Picture Company / Getty Images
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