Every 45 seconds, someone in the United States has a stroke. A stroke happens when a blood vessel carrying blood to the brain is blocked by a blood clot. This is called an ischemic stroke, which is the most common type of stroke. This type of stroke results from clogged arteries. Fatty deposits collect on the wall of the arteries, forming a sticky substance called plaque.
Another type is when a blood vessel breaks open, causing blood to leak into the brain, or a hemorrhagic stroke.
If blood flow is stopped for longer than a few seconds, the brain cannot get blood and oxygen. If brain cells die it can cause permanent damage. A second major cause of stroke is bleeding in the brain hemorrhagic stroke. This can occur when small blood vessels in the brain become weak and burst.
High blood pressure is the number one reason that you might have a stroke. The risk of stroke is also increased by age, family history of stroke, smoking, diabetes, high cholesterol, and heart disease.
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