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LiveScience
LiveScience
Caleb Neal

What are the signs of stroke?

Brain James Lyons
Paramedics taking patient on stretcher from ambulance to hospital.

Each year, more than 795,000 people in the United States have a stroke, and many of these people die as a result.

A stroke occurs when blood flow to a part of the brain is interrupted. This can happen due to a blockage in a blood vessel, in which case it's called an ischemic stroke, or the rupture of a blood vessel, known as a hemorrhagic stroke. Both situations deprive brain cells of oxygen, causing damage that can be life-threatening or lead to long-term disability, if the person survives.

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