Stroke is a form of cardiovascular disease that affects the arteries of central nervous system.
Because of this rupture or blockage, part of the brain doesn't get the flow of blood it needs. Deprived of oxygen, nerve cells in the affected area of the brain can't function and die within minutes. And when nerve cells can't function, the part of the body controlled by these cells can't function either. The devastating effects of stroke are often permanent because dead brain cells aren't replaced. Cerebral thrombosis and cerebral embolism are by far the most common, accounting for about 70-80 percent of all strokes.