What is a stroke?

The brain requires a continuous supply of blood in order to function. A stroke occurs when there is a sudden or partial blockage or rupture of a blood vessel. The blockage or rupture of the blood vessel that carries oxygen, glucose and other nutrients to the brain, causes a rapid decrease in blood flow. Therefore, oxygen and glucose become unavailable. This disrupts the normal function of brain cells, causing chemical reactions within these cells. The affected cells release toxic chemicals and die. The release of these toxic chemicals causes the death of other cells, and this cascade continues.

There are two main types of stroke:


However, all types of stroke are potentially serious or even fatal and require emergency treatment.