A brain stroke happens when the brain's blood supply is interrupted or severely reduced, depriving brain tissue of oxygen and nutrients. This can lead to brain cell damage or death within minutes. According to the provided information, a stroke is a medical emergency that can be caused by various factors:
Common Causes of Stroke
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Blocked Artery (Ischemic Stroke): This is the most common type of stroke. It occurs when a blood clot or other obstruction blocks an artery supplying blood to the brain.
- Example: A blood clot forms in the heart and travels to the brain, blocking a cerebral artery.
- Reference: "It can be caused by a clot that blocks blood flow."
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Leaking or Bursting Blood Vessel (Hemorrhagic Stroke): This type of stroke occurs when a blood vessel in the brain ruptures, causing bleeding into the surrounding brain tissue.
- Example: An aneurysm (a weakened area in a blood vessel wall) bursts, causing bleeding in the brain.
- Reference: "It can be caused by...bleeding..."
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Narrowed Artery (Stenosis): A narrowed artery reduces the amount of blood flowing to the brain.
- Example: Plaque builds up in an artery over time, causing it to narrow (atherosclerosis).
- Reference: "It can be caused by a narrowed blood vessel..."
Summary Table: Causes of Stroke
Cause | Description | Example |
---|---|---|
Blocked Artery | Blood clot or other obstruction blocks an artery supplying blood to the brain. | Blood clot traveling from the heart to the brain. |
Leaking/Bursting Blood Vessel | A blood vessel in the brain ruptures, causing bleeding into the surrounding brain tissue. | Rupture of an aneurysm. |
Narrowed Artery | A narrowed artery reduces the amount of blood flowing to the brain. | Plaque buildup (atherosclerosis) in a cerebral artery. |
Why is it an Emergency?
Because brain cells begin to die within minutes of being deprived of oxygen, stroke is always a medical emergency. Quick treatment can minimize brain damage and potential complications. It is important to recognize the symptoms of a stroke and seek medical assistance immediately.