Stroke is an emergency "brain attack", cutting off vital blood flow and oxygen to the brain.

Ischemic stroke occurs when arteries are blocked by blood clots or by the gradual build-up of plaque and other fatty deposits. About 87% of all strokes are ischemic.

Hemorrhagic stroke occurs when a blood vessel in the brain breaks leaking blood into the brain. Hemorrhagic strokes account for 13% of all stroke deaths.