How do I know if I have high blood pressure?

A doctor will diagnose high blood pressure by using a special cuff to measure your diastolic and systolic numbers. Normal blood pressure is usually defined as a systolic pressure of less than 120 mm Hg and a diastolic pressure less than 80 mm Hg. A single high blood pressure reading does not necessarily mean you have hypertension. Your doctor may ask you to come back for several readings. It’s important to be calm and rested when you have your blood pressure taken because the readings can be affected by emotional stress and other external factors. You may find that monitoring your blood pressure at home is helpful.