Health Education
High Blood Pressure Often Has No Warning Signs. Here’s What Your Numbers Mean.
A straightforward guide to hypertension, blood pressure readings, and why regular measurement matters.
AUG 28, 2026
High blood pressure, also called hypertension, happens when the force of blood moving through the blood vessels is consistently too high. It is common, and many people do not know they have it because it often causes no obvious symptoms.
The most reliable way to know your blood pressure is to have it measured correctly and discuss repeated readings with a qualified health professional.
Want a trusted overview of high blood pressure?
The American Heart Association explains what hypertension is, what blood pressure numbers mean, and why monitoring matters.
Learn About High Blood PressureUnderstanding the two numbers
A blood pressure reading has two numbers. The upper number is the systolic pressure, measured when the heart pumps. The lower number is the diastolic pressure, measured between heartbeats.
| Category | Systolic (upper) | Diastolic (lower) |
|---|---|---|
| Normal | Less than 120 | and less than 80 |
| Elevated | 120–129 | and less than 80 |
| Stage 1 hypertension | 130–139 | or 80–89 |
| Stage 2 hypertension | 140 or higher | or 90 or higher |
| Severe hypertension | Higher than 180 | and/or higher than 120 |
One isolated reading does not necessarily establish a diagnosis. Health professionals typically look at repeated measurements and the individual’s overall health when evaluating blood pressure.
Getting a more accurate reading
- Rest quietly for several minutes before measuring.
- Sit with your back supported and your feet flat on the floor.
- Keep the arm supported around heart level.
- Use a cuff that fits the arm correctly and avoid talking during the reading.
- If you monitor at home, keep a record of readings to discuss with your health professional.
Why regular checks matter
Uncontrolled high blood pressure can increase the risk of serious health problems, including heart disease and stroke. Healthy habits can be helpful, and some people may also need medication prescribed by a clinician.
Important: Blood pressure readings above 180/120 mm Hg can require prompt medical attention. If a very high reading occurs together with symptoms such as chest pain, difficulty breathing, weakness, numbness, vision changes, severe pain, or difficulty speaking, seek emergency medical care.
This page is educational and is not a diagnosis, treatment recommendation, or substitute for care from a licensed health professional. Do not stop or change prescribed blood-pressure medication without speaking with the clinician who manages your care.