National Heart, Lung, and Blood Institute

A stroke occurs if the flow of oxygen-rich blood to a portion of the brain is blocked. Without oxygen, brain cells start to die after a few minutes. Sudden bleeding in the brain also can cause a stroke if it damages brain cells.

National Institute of Neurological Disorders and Stroke - Overview

A stroke occurs when the blood supply to part of the brain is suddenly interrupted or when a blood vessel in the brain bursts, spilling blood into the spaces surrounding brain cells.

U.S. Department of Veterans Affairs - General Stroke Information

It is important to know about stroke when caring for your loved one. To be the best caregiver you can, you need to take care of yourself. Learn about the risks for stroke and how to prevent one. You and your loved one can both benefit from this information.

Womenshealth.gov - Stroke Information for Women

A stroke is sometimes called a "brain attack." A stroke can injure the brain like a heart attack can injure the heart. A stroke occurs when part of the brain doesn't get the blood it needs.

There are two types of stroke: Ischemic stroke and Hemorrhagic stroke

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