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Definition
By Mayo Clinic staffBlood pressure is the force exerted on your artery walls as blood flows through your body. Slightly elevated blood pressure is known as prehypertension. Left untreated, prehypertension will likely turn into high blood pressure. Both prehypertension and high blood pressure increase your risk of heart attack, stroke and heart failure.
A blood pressure reading has two numbers. The first, or upper, number measures the pressure in your arteries when your heart beats (systolic pressure). The second, or lower, number measures the pressure in your arteries between beats (diastolic pressure). Prehypertension is a systolic pressure from 120 to 139 millimeters of mercury (mm Hg) or a diastolic pressure from 80 to 89 mm Hg.
You can't see or feel prehypertension, but there's plenty you can do about it. Weight loss, exercise and other healthy lifestyle changes can often control prehypertension — and set the stage for a lifetime of better health.
