Blood pressure is the force with which blood presses against the walls of the arteries. It is recorded as two numbers: one reflects the heart's work during contraction, the other reflects the state of the vessels between beats. Below are reference points for comparing with your own readings.
What the upper and lower pressure readings show
The upper number is systolic pressure. It arises when the heart contracts and pushes blood into the arteries, and it depends on the strength of the heart's contraction and the resistance of the vessel walls. The lower number is diastolic: the pressure in the arteries at the moment the muscle relaxes; it reflects the resistance of the peripheral vessels. The difference between the numbers is pulse pressure, normally 30–50 mmHg.
The analogy is simple: the heart is a pump, the arteries are pipes. The upper number is the pressure at the pump's outlet, the lower is the residual pressure in the pipes between its strokes.
Normal blood pressure in adults: general reference points
Normal is an upper number below 120 and a lower number below 80 mmHg. The range of 120–129 with a lower number below 80 is designated as elevated blood pressure. 130/80–139/89 is stage one hypertension, 140/90 and above is stage two.
The threshold depends on the measurement method: at a healthcare professional, 140/90 and above is considered high; with home measurement, 135/85 and above. A persistent decrease below 90/60 is called hypotension; it can cause dizziness and fainting.
Check your blood pressure: once a year — for people aged 40 and older and everyone with risk factors (excess body weight, pressure of 120/80 and above, hypertension in close relatives, smoking, excess alcohol, caffeine, or salt); at ages 18–39 without risk factors — once every 3–5 years.
Does blood pressure change with age
The age dependence was described by a formula for practically healthy people aged 17–79: systolic = 109 + 0.5 × age + 0.1 × weight, diastolic = 63 + 0.1 × age + 0.15 × weight. The result depends on both age and body weight, so this is not a universal norm for a person without accounting for weight.
Modern understanding is different: in all age groups over 17, pressure below 120/80 is considered optimal, and a rise in readings with age is not a norm. In people over 50, systolic pressure above 140 is a significant risk factor for cardiovascular disease. For adolescents aged 14–16, the upper limit of normal is 129/69.
Calculation by formula is a historical reference point, not a modern norm. The values it gives for people aged 50–60 may look elevated by modern thresholds and are not considered normal.
Are there separate norms for men and women
Blood pressure reference points are given for adults as a whole — for example, pressure below 120/80 is considered optimal; separate boundaries for men and women are not used here.
Do weight and other factors affect blood pressure readings
Blood pressure depends on the time of day, psychological state, stimulants (coffee, tea), and medications that raise or lower it. It is higher at work, slightly lower at home, and minimal during sleep; upon waking it rises sharply — in people with very high blood pressure this is the most dangerous moment for heart attack and stroke.
Obesity is included in the list of risk factors, and body weight is part of the calculation formula. A separate topic is white-coat hypertension: in the office a person is nervous, and the readings come out higher than at home, so home measurements are often more accurate. For an accurate result, doctors take into account whether the person has eaten or smoked and whether they rested before measurement; measurements are repeated to reduce error.
When deviations from the norm require seeing a doctor
High blood pressure usually causes no symptoms, and the only way to find out about it is to measure it. Early detection and treatment reduce the risk of heart disease, stroke, vision problems, and chronic kidney disease.
- home readings regularly 135/85 and above;
- 140/90 and above when measured in a doctor's office;
- pressure below 90/60 with dizziness or fainting;
- 130/80 and above with other diseases or risk factors.
The doctor compares home and office measurements and, if necessary, refers for 24-hour blood pressure monitoring.
A deviation from the norm on its own is not a reason to call an ambulance; 103/112 — if, against the background of high readings, signs of stroke or heart attack (life-threatening conditions) appear.
This material is for reference: it helps you make sense of the numbers but does not replace a doctor's consultation.
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This content is for reference and does not replace a doctor's consultation. Medical disclaimer