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There's a lot of information about the dangers of high blood pressure, but low blood pressure can endanger your health, too.
Normal blood pressure in adults is less than 120/80 mm Hg. The exact level that marks low blood pressure differs from person to person. But the official definition of low pressure is a blood pressure below 90/60, according to the National Heart, Lung and Blood Institute (NHLBI). The American Heart Association (AHA) goes further. The AHA says that low blood pressure is blood pressure that is low enough to cause symptoms of lightheadedness or fainting. The body uses several mechanisms to regulate blood pressure. It can:
These mechanisms help blood pressure return to normal after changes brought on by eating, exercise, sleep, or position. Although chronic low pressure may be a sign of disease, it also can mean good physical conditioning. Athletes often have low blood pressure.
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