Guide
Blood Pressure Basics: What the Two Numbers Mean and Where the Ranges Are
Blood pressure is the force of blood on artery walls, written as two numbers: systolic over diastolic. Under 120 over 80 is normal. The AHA calls 130/80 or higher high blood pressure. About 48.1% of US adults have it, and most have no symptoms. A supplement is not a treatment; follow your clinician's plan.
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What are the two numbers?
The top number, systolic, is the pressure when the heart beats. The bottom, diastolic, is the pressure between beats.
A reading of 118/76 means 118 millimeters of mercury (mm Hg) systolic and 76 diastolic. Both matter. Doctors look at the pair, and at the trend over several readings, not at a single one 1. A cuff on the upper arm at heart level gives the most reliable numbers 2.
Type a reading to see where it falls.
- NormalBelow 120 and below 80
- Elevated120 to 129 and below 80
- Stage 1130 to 139 or 80 to 89
- Stage 2140 or higher or 90 or higher
- Crisis rangeAbove 180 and/or above 120: call your clinician; with chest pain or trouble speaking, call 911
Bands from the CDC, NHLBI and AHA 3 4 1. One reading is not a diagnosis: only a doctor or other medical professional can confirm high blood pressure, and no tool on the gauge measures your pressure. Use a validated upper-arm cuff 2.
What are the ranges?
AHA lists five ranges, from normal to a crisis that needs urgent care.
| Range | Systolic | Diastolic |
|---|---|---|
| Normal | Under 120 | and under 80 |
| Elevated | 120 to 129 | and under 80 |
| Stage 1 | 130 to 139 | or 80 to 89 |
| Stage 2 | 140 or higher | or 90 or higher |
| Crisis | Over 180 | and/or over 120 |
The ranges come from the AHA 1. CDC says high blood pressure is consistently at or above 130/80 3. A diagnosis needs more than one reading and a clinician's judgment.
How common is it?
Very. About 48.1% of US adults, some 119.9 million people, have high blood pressure 5.
Roughly one in four of them has it under control, and about one in three adults with it do not know they have it 4. It rarely causes symptoms, which is why a cuff reading or a clinic check is the only way to know. Left uncontrolled, it raises the risk of heart disease and stroke 6. If a reading is over 180/120 with chest pain, trouble breathing, vision change or weakness, call 911.
What helps?
Medicine when needed, and habits that work with it: less sodium, a DASH-style diet, more activity, a healthy weight, less alcohol, no tobacco and good sleep.
NHLBI lists medicine classes such as ACE inhibitors, ARBs, calcium channel blockers and diuretics 7. DASH sets a sodium limit of 2,300 mg a day, or 1,500 mg if desired, and cut pressure within 2 weeks in a 459-adult trial 8. Losing about 1 kg is linked with about 1 mm Hg lower pressure 9. AHA's Life's Essential 8 adds sleep, cholesterol, glucose and tobacco 10.
- SodiumThe DASH plan sets a limit of 2,300 mg of sodium a day, or 1,500 mg if desired. Mayo Clinic estimates that cutting to 1,500 mg or less lowers pressure about 5 to 6 mm Hg. 8 9
- WeightAbout 1 mm Hg lower for each kilogram (2.2 pounds) lost, per Mayo Clinic's estimate. 9
- Eating patternA DASH-style plan with less salt can work about as well as medicine for some people; Mayo estimates up to 11 mm Hg from a healthy diet. 8 7 9
- ActivityRegular aerobic exercise lowers systolic pressure about 5 to 8 mm Hg. Adults are advised 2.5 hours of moderate activity a week. 9 10
- Tobacco and sleepQuitting tobacco and getting 7 to 9 hours of sleep are two of Life's Essential 8. 10
- Not knowingAbout 1 in 3 U.S. adults with high blood pressure are unaware and untreated. It has no symptoms, so only measuring shows it. 4 3
Why you should not stop a medicine?
AHA says: even if you feel fine, never cut back or quit a prescribed medicine on your own 11.
Pressure can rise again quickly after stopping. If a medicine causes a side effect, tell your clinician, who can change the dose or the drug. A supplement does not replace this step. NCCIH notes that no dietary supplement has been shown to work like blood-pressure medicine 12. See the medicines page.
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See packsHow do you measure it well?
At home, with a validated upper-arm cuff, after five minutes of rest, back supported, feet flat, cuff at heart level, no talking.
Take two readings a minute apart and write down both. Avoid smoking, caffeine and exercise for 30 minutes before 2. Use the animated coach on the home reading page to see the steps.
Why does it matter?
High pressure strains the artery walls and the heart over years. It is a leading risk factor for heart disease and stroke.
CDC says about 1 in 5 US deaths, 22%, is due to heart disease, and that high blood pressure, high cholesterol and smoking are key risk factors 6. The reason to know your numbers is that you can act on them. Treatment and habits work, and early action costs far less than late repair. Knowing your number is also the first step in judging any product: without a baseline you cannot tell whether anything changed.
Blood pressure also moves through the day. It dips in sleep, rises with effort or stress, and varies with salt, caffeine and pain. That is why one clinic reading can mislead, and why a home log is so useful. Many clinicians now ask for home readings, taken in a standard way, before they adjust medicine 2.
What can you do this week?
Five small steps need no purchase and no capsule.
Learn your number
Get a clinic reading or a validated home cuff.
Cut back on salt
Check food labels for sodium; DASH aims for 2,300 mg a day or less 8.
Move more
Walk most days. Activity is one of the Life's Essential 8 10.
Limit alcohol and quit tobacco
Ask for help if you need it.
Take medicine as prescribed
Ask your pharmacist for a refill reminder 11.
None of these is dramatic. Together they are the strongest tools we have, and the benefits page sets any capsule next to them.
Which myths are common?
Three myths cause harm: that you can feel high pressure, that a good reading means you can stop medicine and that a natural product is always safe.
High pressure usually has no symptoms 4. A good reading on medicine means the medicine works, not that you no longer need it 11. Natural does not always mean safe, as NCCIH notes 13. Keep these three in mind when you read any sales page.
FAQ01
Melonex questions people ask
What is a normal blood pressure?
Under 120 over 80 mm Hg, per AHA.
What is high blood pressure?
130/80 or higher on repeated readings is called high by AHA and CDC. A clinician makes the diagnosis.
What does the top number mean?
It is systolic pressure, when the heart beats.
Does high blood pressure cause symptoms?
Usually not, which is why checks matter.
When is a reading an emergency?
Over 180/120 with chest pain, trouble breathing, vision change or weakness means 911.
Can a supplement lower blood pressure?
No supplement has been shown to work like medicine. Talk to your clinician.
Who wrote this02
Written and reviewed by
Pages built from the label, the sales page and linked NIH, FDA, CDC, FTC and peer-reviewed sources.
Last updated . Read our editorial standards and how we check reviews. This website is the information site for a USA Authorized Melonex Retailer. It is not the manufacturer or the distributor named on the label. We earn money when you buy through our order links.
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