A stroke occurs when a blockage or rupture of the blood vessels  interrupts or decreases the supply of blood to the brain. When this happens, the brain does not receive enough oxygen or nutrients, and brain cells start to die.Stroke is a cerebrovascular disease. This means that it affects the blood vessels that feed the brain oxygen. If the brain does not receive enough oxygen, damage may start to occur. It’s medical emergency. Although many strokes are treatable, some can lead to disability. Early and proper physiotherapy helps in getting back to normal life.