Brain cell function requires a constant delivery of oxygen and glucose from the bloodstream. A stroke, brain attack or cerebrovascular accident (CVA), occurs when blood supply to part of the brain is disrupted, causing brain cells to die. Blood flow can be compromised by a variety of mechanisms.
The signs and symptoms of a stroke often develop quickly. However, they can develop over hours or even days.
Migraine is a form of vascular headache which can cause severe throbbing pain or a pulsing sensation, usually on just one side of the head.