High Blood Pressure
High Blood Pressure

High Blood Pressure What Is High Blood Pressure

Also known as Hypertension

An NHLBI video about high blood pressure, or hypertension, is a common condition that occurs when your blood pressure—the force of the blood on the walls of your arteries—is often too high. Medical Animation Copyright © 2022 Nucleus Medical Media, All rights reserved.

Half of all Americans have high blood pressure, also known as hypertension, and many don’t even know they have it. High blood pressure develops when blood flows through your arteries at higher-than-normal pressures. Your blood pressure is made up of two numbers: systolic and diastolic. Systolic pressure is the pressure when the ventricles pump blood out of the heart. Diastolic pressure is the pressure between heartbeats when the heart is filling with blood.

Your blood pressure changes throughout the day based on your activities. For most adults, a normal blood pressure is less than 120 over 80 millimeters of mercury (mm Hg), which is written as your systolic pressure reading over your diastolic pressure reading — 120/80 mm Hg. Your blood pressure is considered high when you have consistent systolic readings of 130 mm Hg or higher or diastolic readings of 80 mm Hg or higher.

Blood Pressure Levels


Systolic and diastolic readings


systolic: less than 120 mm Hg
 diastolic: less than 80 mm Hg


systolic: 120–129 mm Hg
 diastolic: less than 80 mm Hg

High blood pressure

systolic: 130 mm Hg or higher
 diastolic: 80 mm Hg or higher

You usually don’t have symptoms from high blood pressure until it has caused serious health problems. About 1 in 3 U.S. adults with high blood pressure aren’t even aware they have it and are not being treated to control their blood pressure. That is why it is important to have your blood pressure checked at least once a year.

To control or lower high blood pressure, your provider may recommend that you adopt a heart-healthy lifestyle. This includes choosing heart-healthy foods such as those in the DASH eating plan. You may also need to take medicines. Controlling or lowering blood pressure can help prevent or delay serious health problems such as chronic kidney disease, heart attack, heart failure, stroke, and possibly vascular dementia.

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