The causes, symptoms, and treatment of a stroke.
Strokes occur when blood flow to the brain is disrupted. There are two major classifications: ischemic and hemorrhagic.
In an ischemic stroke, a blood vessel within the brain becomes obstructed. This can either be from the formation of a clot within the blood vessel or a clot from elsewhere (usually from within the heart) traveling into the brain (an embolism).
In a hemorrhagic stroke, a blood vessel within the brain ruptures. This leads to a loss of blood flow to the part of the brain that blood vessels served. Also, the expanding collection of blood compresses and further damages the brain. These types of strokes can be caused by severe hypertension or an aneurysm.