What Are The Causes Of Human Strokes

When blood supply to the brain is impaired it causes human strokes. This is because adequate oxygen and glucose can not be delivered to the brain cells. Impaired blood supply to the brain can happen mainly due to narrowing of arteries, hardening of blood vessels (known as atherosclerosis), due to presence of blood clots, or other reasons. A majority of strokes are cause due to blockage of blood flow to brain (called ischemic strokes) and the remaining due to uncontrolled bleeding (called hemorrhagic strokes).

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Blockage of blood in the brain can be due to the presence of a clot in a blood vessel in the brain, causing a stroke (known as thrombotic stroke). Common causes for narrowing of a blood vessel include high blood pressure, high cholesterol or due to smoking. This is the most common cause of stroke, and people with a family history of any of these conditions should get themselves checked regularly.

A clot, cholesterol or calcium deposit in a blood vessel in another part of the body can also cause a stroke if it reaches the brain. This type of stroke is known as an embolic stroke. The source of this clot or plaque can be elsewhere in the body, and only results in a stroke when it blocks normal blood flow in the brain.

If hemorrhage of a blood vessel in the brain results in bleeding, it could disrupt supply of essential nutrients to the brain and result in a stroke. Bleeding in the brain also causes swelling in the brain and pressure within the brain is created, further damaging it. Hemorrhage in a blood vessel in the lining of the brain also cause neurological damage. Often, in this case, patients experience a severe headache and a stiff neck, and if not treated can result in coma and death.

In rare cases, inflamed blood vessels (a condition known as vasculitis) can also lead to a stroke. Migraines are also associated with stroke-like symptoms. This is also due to narrowing of blood vessels. This condition often doe not last very long and symptoms subside after the migraine attack.

Other possible causes that could increase the chances of having a stroke include hypertension, diabetes, and accumulation of bad cholesterol in the body and lack of exercise. Strokes generally leave some kind of permanent damage in the brain. In a large number of cases, patients experience early signs or a mini stroke (transient ischemic attack). If heeded, a major episode of stroke can be avoided.

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