A stroke results from an acute event that causes lack of blood supply to a part of the brain. This blockage usually affects a cerebral artery (know as ischemic) or is due to a sudden increased cerebral pressure after a blow in the head. It could cause internal bleeding and /or massive swelling inside the skull compressing the arteries (known as hemorrhagic). As a result the blood supply to the brain cells is stopped. Our brain cells need oxygen and nutrients continuously to keep them alive. Any deficit in blood flow could automatically stop their function leading to cellular death.
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