A stroke is a sudden loss of brain function lasting for at least 24 hours. Episodes lasting less than 24 hours are usually defined as transient ischaemic attacks (TIAs). Strokes are caused either by the interruption of flow of blood to the brain (ischemic stroke) or the rupture of blood vessels in the brain (hemorrhagic stroke). Strokes are the most common form of cerebrovascular disease, which include all conditions affecting the circulation of blood in the blood vessels of the brain.
This HealthSTATS section has data on the following: