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.


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.

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