Explanation of Blood Pressure Readings

Blood pressure is the measurement of the pressure your blood exerts against your artery walls. If you are confused about the difference between systolic and diastolic, the following sections will help to decode what your blood pressure reading really means.

What Does Systolic or Diastolic Mean?

When your doctor tells you that your blood pressure is 120 over 80, the higher number is your systolic number. This is created by the force of your heart’s contractions.

The second number (the lower number) is your diastolic number. This is measures the pressure between heart beats.

Normal Blood Pressure Readings

According to the American Heart Association, if your systolic number is lower than 120 and your diastolic number is lower than 80, your blood pressure is normal.

Hypotension

The normal range varies among individuals, but having readings 20 mm Hg or more below normal may indicate low blood pressure (hypotension). Hypotension can cause symptoms like fainting, weakness, confusion and dizziness.

Pre-Hypertension

A systolic number between 120 and 139 or a diastolic number between 80 and 89 puts you into the category of pre-hypertension. Lifestyle changes are recommended to prevent further complications.

Stage 1 Hypertension

According to the Mayo Clinic, systolic numbers between 140 and 159 or diastolic numbers between 90 and 99 indicate stage 1 hypertension. Start with a healthy diet and exercise program. After 6 months, if your numbers are not improved, you may need medication.