High Blood Pressure: Prevention, Diagnosis and When to See a Doctor
High blood pressure rarely causes symptoms, yet it quietly damages arteries, heart and kidneys. Our editorial team explains how hypertension is diagnosed in the UK, how to prevent it and which sport-related substances push readings upwards.
Why blood pressure matters for active people
High blood pressure, or hypertension, is one of the leading modifiable risk factors for stroke, heart attack, heart failure and kidney disease. It usually causes no symptoms, which is why it is often called a silent condition.
Being fit lowers the risk but does not rule it out. Genetics, age, salt intake, alcohol, sleep apnoea and some substances used in sport can all raise blood pressure, even in people who look healthy.
In strength sports there are particular concerns. Anabolic-androgenic steroids, stimulant pre-workouts, high-dose caffeine, decongestants and non-steroidal anti-inflammatory drugs (NSAIDs) can push blood pressure upwards. Large body mass can also make standard cuffs read inaccurately.
Knowing your numbers is therefore a basic part of looking after yourself as an athlete.
How hypertension is defined and diagnosed in the UK
The National Institute for Health and Care Excellence (NICE) guideline NG136 sets out how hypertension is diagnosed in England. A single high reading in the surgery is not enough; the diagnosis is confirmed with home or ambulatory monitoring.
| Category | Clinic reading | Home or ambulatory average |
|---|---|---|
| Stage 1 hypertension | 140/90 mmHg or higher | 135/85 mmHg or higher |
| Stage 2 hypertension | 160/100 mmHg or higher | 150/95 mmHg or higher |
| Severe hypertension | Systolic 180 or diastolic 120 mmHg or higher | Needs prompt clinical assessment |
Ambulatory blood pressure monitoring (ABPM) involves wearing a cuff that measures automatically over 24 hours. It helps identify "white-coat hypertension", where readings are only high in a clinical setting.
Once hypertension is confirmed, doctors usually check for organ damage and other risk factors: urine tests for protein, blood tests for kidney function, cholesterol and glucose, an ECG and sometimes an eye examination.
Free blood pressure checks are available at many community pharmacies in England for adults over 40, and the NHS Health Check for 40–74-year-olds includes a measurement.
Prevention through lifestyle
Lifestyle changes can prevent hypertension and are the first step of treatment. The evidence for several measures is robust.
- Salt: reducing intake toward the UK target of no more than 6 g a day lowers blood pressure, as shown by He and MacGregor's meta-analyses.
- Exercise: aerobic, dynamic resistance and isometric training all reduce blood pressure; isometric handgrip and wall-sit exercises performed well in a 2013 meta-analysis.
- Body weight: losing excess weight has one of the largest effects.
- Alcohol: staying within 14 units a week.
- Diet: more vegetables, fruit, pulses and low-fat dairy, in the style of the DASH diet.
- Sleep: treating obstructive sleep apnoea, which is more common in heavier strength athletes.
Heavy lifting with a held breath causes very large, brief spikes in pressure. This is normal physiology, but people with uncontrolled hypertension should discuss safe training with their doctor.
Substances in sport that raise blood pressure
Several drugs and supplements used in gyms can contribute to hypertension. The Endocrine Society statement by Pope and colleagues describes elevated blood pressure as one of the cardiovascular effects of anabolic steroid misuse, alongside adverse lipid changes and heart muscle thickening.
Stimulants, including high-dose caffeine, synephrine and illegal substances such as DMAA, can cause acute rises in pressure and heart rate. Clenbuterol, which is not licensed for human use in the UK, can cause rapid heart rate, palpitations and arrhythmias.
Some prescribed and over-the-counter medicines also play a role: NSAIDs such as ibuprofen taken regularly, decongestants containing pseudoephedrine, and liquorice in large amounts.
Anyone using such substances should tell their doctor, because it changes how blood pressure is interpreted and managed. Stopping the cause often brings readings down, although some changes may persist.
When to see a doctor
Arrange a routine GP appointment if home readings are repeatedly 135/85 mmHg or above, or if a pharmacy check shows high blood pressure. Treatment decisions consider overall cardiovascular risk, not just the number.
Seek urgent help (NHS 111, or 999 in an emergency) if a reading is 180/120 mmHg or higher together with symptoms such as severe headache, chest pain, shortness of breath, visual disturbance, confusion, weakness or numbness. These can indicate a hypertensive emergency or stroke.
Athletes with high blood pressure should also be checked before competing in intense or contact sports, and those using anabolic steroids should have a full cardiovascular assessment.
If medication is prescribed, it does not prevent training. Doctors can choose drugs that suit athletes, and with good control, most people continue to exercise normally.
Editorial conclusions
Hypertension often develops silently, including in fit people. Regular measurement at home or at a pharmacy is the simplest form of prevention, and UK guidance requires home or ambulatory readings to confirm a diagnosis.
Exercise, salt reduction, weight control and moderate alcohol intake are powerful tools, while stimulants, anabolic steroids and regular NSAIDs can work against them.
Very high readings with symptoms are an emergency; consistently raised readings deserve a planned GP visit.
For further reading, see our articles on choosing a home blood pressure monitor, the cardiovascular effects of anabolic steroids, and caffeine safety in pre-workouts.
References
- National Institute for Health and Care Excellence. Hypertension in adults: diagnosis and management. NICE guideline NG136. London: NICE; 2019.
- Williams B, Mancia G, Spiering W, et al. 2018 ESC/ESH Guidelines for the management of arterial hypertension. Eur Heart J. 2018;39(33):3021–3104.
- Cornelissen VA, Smart NA. Exercise training for blood pressure: a systematic review and meta-analysis. J Am Heart Assoc. 2013;2(1):e004473.
- He FJ, Li J, MacGregor GA. Effect of longer term modest salt reduction on blood pressure: Cochrane systematic review and meta-analysis of randomised trials. BMJ. 2013;346:f1325.
- Pope HG Jr, Wood RI, Rogol A, et al. Adverse health consequences of performance-enhancing drugs: an Endocrine Society scientific statement. Endocr Rev. 2014;35(3):341–375.
- Whelton PK, Carey RM, Aronow WS, et al. 2017 ACC/AHA/AAPA/ABC/ACPM/AGS/APhA/ASH/ASPC/NMA/PCNA guideline for the prevention, detection, evaluation, and management of high blood pressure in adults. Hypertension. 2018;71(6):e13–e115.
