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The bottom number, called the diastolic pressure, is the measurement as the heart relaxes between beats. Normal blood pressure is a systolic pressure of less than 120 millimeters of mercury (mm Hg) and a diastolic pressure of less than 80 mm Hg, or 120/80 mm Hg, according to the American Heart Association (AHA). Having a blood pressure greater than 140/90 mm Hg is considered high blood pressure or hypertension. A blood pressure level between normal and hypertension, is called prehypertension, meaning it is higher than normal, but not high enough to be considered hypertension.
Blood pressure is the force exerted on the inner walls of blood vessels as the heart pumps blood to all parts of the body. The upper reading, known as the systolic pressure, measures that force as the heart contracts and pushes blood out of its chambers. The lower reading, known as diastolic pressure, measures that force as the heart relaxes between contractions. Adult blood pressure is considered normal at 120/80. The recommendations are based on clinical evidence showing that stricter guidelines provided no additional benefit to patients, explained guidelines author Dr. Paul James, head of the department of family medicine at the University of Iowa Carver College of Medicine.