High blood pressure (hypertension) affects approximately 14 million UK adults — and around a third of those don’t know they have it. It causes no symptoms yet silently damages blood vessels, increasing risk of stroke, heart attack and kidney disease. Regular monitoring is the first step to taking control.

Understanding Your Readings

Blood pressure is recorded as two numbers: systolic (pressure when the heart beats) over diastolic (pressure between beats), measured in mmHg. Normal: below 120/80. Pre-hypertension: 120–139/80–89. Stage 1 hypertension: 140–159/90–99. Stage 2: 160+/100+. Hypertensive crisis: above 180/120 — seek urgent medical attention. Note that a single elevated reading doesn’t confirm hypertension; diagnosis requires consistently elevated readings over time.

Why Home Monitoring Matters

“White coat hypertension” — elevated readings in clinical settings due to anxiety — affects up to 20% of those referred for hypertension assessment. NICE guidance recommends that all people with suspected hypertension should have ambulatory blood pressure monitoring (ABPM) or home blood pressure monitoring (HBPM) to confirm the diagnosis before starting treatment. HBPM also allows you to track the effect of lifestyle changes and medication.

Choosing a Blood Pressure Monitor

Upper arm monitors are significantly more accurate than wrist monitors (wrist position critically affects accuracy). Choose a device validated by the British or European Society of Hypertension (check the validation list at bhsoc.org). Key features: correct cuff size for your arm circumference (an incorrect cuff size gives inaccurate readings), memory function (stores readings for review), and Bluetooth connectivity if you want to sync with an app or share readings with your GP. Omron, Withings and A&D are trusted brands.

How to Measure Accurately

Measure at the same times each day — ideally morning and evening. Sit quietly for 5 minutes before measuring. Don’t exercise, drink caffeine, or smoke for 30 minutes before. Sit with back supported, feet flat on floor, arm at heart level (rest on table). Take three readings 1 minute apart and record the average of the last two. Use the left arm unless instructed otherwise (slightly higher readings in left arm are normal).

Lifestyle Changes That Lower Blood Pressure

Reduce salt — the UK average salt intake is around 8g/day; NHS target is below 6g. A 3g/day reduction produces approximately 3–4mmHg systolic fall — equivalent to medication for borderline hypertension. DASH diet — high in fruit, vegetables, wholegrains, low-fat dairy, limited red meat. Reduces BP by 8–14mmHg in some studies. Exercise — 30 minutes of moderate aerobic activity 5 days per week reduces BP by 4–9mmHg. Weight loss — 1kg loss produces approximately 1mmHg reduction. Alcohol — limit to 14 units/week. Quit smoking — each cigarette temporarily raises BP; long-term quitting improves vascular health. Sleep — poor sleep (under 6 hours) is an independent risk factor for hypertension.

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