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Each day that your blood pressure is too high, your chances of having a stroke are increased. A stroke is a loss of brain function caused by a lack of blood to the brain. Stroke can result from the damage that ongoing high blood pressure causes in your vessels. If the affected vessel stops supplying blood to the brain, a stroke results.
When blood presses against a vessel wall with too much force, muscles in the wall lose their stretch. This causes the wall to thicken, which narrows the vessel passage and reduces blood flow.
When blood pressure is too high, it can damage blood vessel walls. Fat and cholesterol (plaque) collect in the damaged spots. Blood cells stick to the plaque, forming a mass called a clot. A clot can block blood flow in the vessel.
Sometimes blood flows with enough force to weaken a vessel wall. If the vessel is small or damaged, the wall can break. When this happens, blood leaks into nearby tissue and kills cells. Other cells may die because blood cannot reach them.
During a stroke, blood supply to the brain is cut off. But with prompt medical help, a better recovery is more likely. Think of a stroke as a brain attack. Don’t wait. Call 911 if you have any of the symptoms below:
Weakness or numbness on one side of the face or body, including a leg or an arm
Sudden trouble seeing with one or both eyes
Trouble talking, such as slurred speech
Problems using or understanding words
Dizziness or loss of balance
Any of these symptoms that come and go