There are two main types of stroke:

• Ischemic strokes:
• Caused by a blood clot that blocks an artery in the brain
• The clot cuts off the blood flow to an area in the brain
• Hemorrhagic strokes:
• Caused by bleeding from an artery in the brain
• This interrupts the blood flow to an area of the brain

Brain cells are very sensitive to a lack of blood flow. Without oxygen and glucose from the bloodstream, they begin to die within minutes.