Causes of ischemic stroke
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
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
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
- Inflammation in the blood vessels, which may
develop from conditions such as
- Blood-clotting disorders,
- Head or neck injuries that
result in damage to blood vessels in the head or neck.
treatment for cancer in the neck or brain.
- Cerebral amyloid
angiopathy (a degenerative blood vessel disorder).