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Causes of ischemic stroke
An ischemic stroke is caused by a blood clot that blocks blood flow to the brain.
Low blood pressure may also cause an ischemic stroke, although this is less common. Low blood pressure results in reduced blood flow to the brain. It may be caused by narrowed or diseased arteries, a heart attack, a large loss of blood, or a severe infection.
Some surgeries (such as endarterectomy) or other procedures (such as carotid artery stenting) that are used to treat narrowed carotid arteries may cause a blood clot to break loose, resulting in a stroke.
Causes of hemorrhagic stroke
A hemorrhagic stroke is caused by bleeding in or around the brain.
Other less common causes include head or neck injuries, certain diseases, and radiation treatment for cancer in the neck or brain.
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