Systolic BP
Systolic Blood Pressure
Systolic blood pressure is the pressure in your arteries when your heart contracts. It is the top number in a reading such as 120/80. The bottom number matters too.
What does a high top number mean?
Blood pressure that stays high puts extra strain on your heart and blood vessels. One reading can rise with stress, pain or recent activity. Diagnosis usually relies on repeated measurements and both numbers.
Adult categories use both blood pressure numbers
- Low systolic pressure
- Below 90 mmHg; symptoms and usual readings matter
- Below the elevated systolic threshold
- 90 to below 120 mmHg; bottom number must also be below 80
- Elevated systolic pressure
- 120–129 mmHg, with bottom number below 80
- Stage 1 systolic hypertension
- 130–139 mmHg
- Stage 2 systolic hypertension
- 140 mmHg or more
These AHA categories describe the systolic number. A higher diastolic (bottom) number can put you in a higher category. They are clinical categories, not a personal treatment goal, and pregnancy needs separate guidance.
Sources: American Heart Association; American Heart Association
What can change this result?
What can raise it
- Regularly eating a lot of salt, including in packaged foods and sauces.
- Drinking too much alcohol or being inactive.
- Stress, pain, caffeine or nicotine shortly before the measurement.
What can help lower it
- Choosing less salty foods and using less salt in cooking.
- Regular activity and managing excess weight, if relevant.
- Taking blood-pressure medicine as prescribed and cutting back on alcohol.
A cuff that does not fit, talking or not resting before the test can distort the reading. Sleep apnea, kidney conditions and some medicines can also raise blood pressure.
What should I do next?
- Sit quietly before measuring, support your arm and use a correctly sized cuff. Keep a record of both numbers.
- Review repeated high readings with your clinician rather than changing medication yourself.
- If the top number is over 180 or the bottom number is over 120, repeat after at least one minute. If still this high, contact a healthcare professional immediately. With chest pain, breathlessness, weakness or vision changes, seek emergency care immediately.
How this test works
Blood pressure changes throughout the day. A cuff estimates the pressure during a heartbeat and between beats. Home readings can help show whether a high clinic result reflects an ongoing pattern.