Hypertension, or high blood pressure, is a main cause of heart and blood vessel (cardiovascular) disease. Hypertension greatly raises your risk of heart attack, stroke and kidney failure, which may lead to death. Since people with hypertension often have no symptoms, it has been called “the silent killer.”
As blood flows through the body, it pushes against the walls of the arteries. The force of this push in the arteries is the blood pressure. The measurement of blood pressure includes two readings. An example is 120/80 mm Hg (millimeters of mercury). The first number is the systolic pressure as the heart contracts; the second number is the diastolic pressure when the heart relaxes between beats.
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Resource:
The Hormone Foundation
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