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Causes of ischemic stroke
An ischemic stroke is caused by a blood clot that blocks blood flow to the brain. A blood clot can develop in a narrowed artery that supplies the brain or can travel from the heart (or elsewhere in the body) to an artery that supplies the brain.
Blood clots are usually the result of other problems in the body that affect the normal flow of blood, such as:
Low blood pressure (hypotension) may also cause an ischemic stroke, although less commonly. Low blood pressure results in reduced blood flow to the brain and may develop as a result of 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 inside the brain (called intracerebral hemorrhage) or bleeding in the space around the brain (called subarachnoid hemorrhage). Bleeding inside the brain may be a result of long-standing high blood pressure. Bleeding in the space around the brain may be caused by a ruptured aneurysm or uncontrolled high blood pressure.
Other causes of hemorrhagic stroke are less common but include:
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