Nurse with blonde hair taking blood pressure of woman with pink scarf who is sitting down.

Blood pressure is the force of your blood pushing against the walls of your arteries as your heart pumps blood to your body.

Blood pressure readings are given as 2 numbers. The top number is called the systolic pressure. It is the highest pressure in the blood vessels when the heart is pumping. The bottom number is called the diastolic pressure. It is the lowest pressure in the blood vessels when the heart is resting between beats.

Blood pressure is usually written like this: 140/90. You may hear it said as “140 over 90.”

Blood pressure ranges are:

  • 119/79 or lower is normal blood pressure
  • 120/80 to 139/89 is prehypertension
  • 140/90 or higher is high blood pressure

Prehypertension means that you may develop high blood pressure but you can prevent it with healthy lifestyle changes.

High blood pressure, also called hypertension, that stays high over time can lead to serious problems including: