What Causes a Stroke?

A stroke happens when a blood clot (embolism) travels from another part of the body and lodges within an artery in the brain, causing a loss of blood flow to part of the brain. If this happens, brain cells cannot get the oxygen and nutrients they need, and they start to die within a few minutes. A stroke can cause lasting brain damage, long-term disability, or even death. This 49 second video explains the causes of stroke.