Blood pressure is the force at which blood pumps from the heart into the arteries. A normal blood pressure reading is less than 120/80 mm Hg.
When blood pressure is high, the blood moves through the arteries more forcefully. This puts increased pressure on the delicate tissues in the arteries and damages the blood vessels.
High blood pressure, or hypertension, affects about half of American adults, estimates the American College of Cardiology.
Known as a “silent killer,” it usually doesn’t cause symptoms until there’s significant damage done to the heart. Without visible symptoms, most people are unaware that they have high blood pressure.