A stroke is an illness in which part of the brain is suddenly severely damaged or destroyed. The result is loss of function of the affected part of the brain. It usually causes weakness, paralysis of the arm and leg on either the left or right side of the body, twisting of the face, and in some cases other effects which may include loss of balance, and difficulty in swallowing. In very severe cases, there is a loss of consciousness or confusion of thought. The damage in the brain is caused by a blood clot or haemorrhage. If the clot is very big or if it affects a vital part of the brain, the patient may die. In less severe cases partial or complete recovery occurs.
It also means an interruption of the blood supply to the brain due to blocked or burst arteries. As a result, the cells in the affected part of the brain do not receive enough oxygen, which they need for survival. Without oxygen, the cells start dying. The impacts of a stroke are sudden and they are characterized by difficulty in walking, speaking, seeing, and feeling.