A blood pressure reading has two numbers. The top number (systolic) measures the pressure in your arteries when the heart beats, and the bottom number (diastolic) measures it between beats. The American Heart Association lists a normal reading as lower than 120/80 mm Hg.
High blood pressure usually causes no symptoms, so regular checks matter. One high reading is not a diagnosis, because blood pressure changes through the day. Doctors look at repeated readings over time.
- Sit quietly for about five minutes before measuring.
- Keep your feet flat and your arm supported at heart level.
- Avoid caffeine, exercise and smoking for 30 minutes beforehand.
Ask your doctor what target is right for you. If a high reading comes with chest pain, shortness of breath, vision changes or trouble speaking, call 911.
