If large enough, the obstructions may restrict or completely block blood flow through the artery. Blockage of arteries supplying the brain causes stroke if alternative routes are not available to deliver an adequate blood supply 2. The materials are usually generated in one part of the body and travels throughout the body until it becomes trapped in a blood vessel. The blood vessel then is unable to supply the brain with blood and nutrients. Hemorrhage results from a rupture of a blood vessel located in the brain.
Blood erupts at high pressure in the brain or in tissue surrounding the brain.
Normal brain cells may be destroyed. The presence of blood often results in severe headache, lethargy, or coma . Most strokes are associated with atherosclerosis , high blood pressure , oxygen damage or a combination of the three. Stroke affects different people in different ways, depending on the type of stroke, the area of the brain affected and the extent of the brain injury. Brain injury from a stroke can affect the senses, motor activity, speech and the ability to understand speech, behavioral patterns, thought patterns, memory and emotions .