A stroke is caused by the failure of the blood vessel in supplying blood to the brain, causing sudden or rapid loss of brain functions. It is classified as such when sensory deficit persists for greater than 24 hours or results in death. Stroke includes Ischemia stroke (lack of blood flow) caused by blockage AND Intracranial hemorrhage (leakage of blood).
  Two broad categories of stroke

- Ischemia stroke caused by blockage (lack of blood flow) incidence rate 70%
- Intracranial hemorrhage (leakage of blood).

1) Ischemia stroke – there are many causes;
- Due to the hardening or narrowing (Atherothrom-bosis) of the veins and arteries which supply blood to the brain. The disruption of blood supply to part of the brain causes brain cells to die and the brain quickly swells, squeezing and putting pressure on other parts of the brain.
- Small blood clots travel in the blood stream
- Weakening of a small blood vessel

2) Intracranial hemorrhage – there are many causes
- Bleeding within the brain due to deterioration of the inner lining of the blood vessel wall.
- Bleeding within the brain due to Amyloid an-giopathy
- Result from ruptured aneurysm causing subarachnoid hemorrhage
- A rupture of an abnormal connection between arteries and veins (arteriovenous malformation) in or around the brain causing subarachnoid hemorrhage – bleeding into the space between the inner layer and middle layer of the tissue covering the brain
Risk factors

• Elderly people
• Male
• Genetics with family history
• People with high blood pressure
• Diabetics
• Smoking
• Physical inactivity
• People with high level of cholesterols
• Ischemic heart disease
• Cardiac arrhythmias