High blood pressure, or hypertension, is called the “silent killer” for good reason. It often has no symptoms, but is a major risk for heart disease and stroke. And these diseases are among the leading causes of death in the United States (1Trusted Source).
About one in three U.S. adults has high blood pressure (2Trusted Source).
Your blood pressure is measured in millimeters of mercury, which is abbreviated as mm Hg. There are two numbers involved in the measurement:
- Systolic blood pressure. The top number represents the pressure in your blood vessels when your heart beats.
- Diastolic blood pressure. The bottom number represents the pressure in your blood vessels between beats, when your heart is resting
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