High blood pressure usually causes no warning signs. A person may feel completely well while elevated pressure gradually increases the risk of stroke, heart disease, kidney disease and vision problems. Measuring blood pressure correctly is the only reliable way to know whether it is high.
What the numbers mean
A blood-pressure reading has two numbers. The systolic number is the pressure when the heart contracts; the diastolic number is the pressure when the heart relaxes. A diagnosis should not normally be based on one hurried reading. Clinicians interpret repeated measurements, medical history, medicines and overall cardiovascular risk.
Definitions and treatment targets can vary according to the clinical guideline and the individual. Discuss your readings with a qualified healthcare professional rather than diagnosing yourself from an online chart.
How to measure at home
- Use a validated upper-arm monitor and the correct cuff size.
- Avoid exercise, smoking and caffeine shortly before measurement.
- Empty your bladder and sit quietly for several minutes.
- Keep your back supported, feet flat and legs uncrossed.
- Support the bare arm at heart level.
- Take repeated readings according to your clinician’s instructions and record them.
A cuff that is too small, talking during the measurement or placing the cuff over clothing can produce misleading results. Bring the monitor to an appointment occasionally so its use can be checked.
Reducing long-term risk
Helpful measures may include reducing excess sodium, eating a varied pattern rich in vegetables and other minimally processed foods, regular physical activity, avoiding tobacco, maintaining a suitable weight, moderating alcohol and treating sleep apnoea when present. Lifestyle changes do not mean prescribed medicine is unnecessary.
Take blood-pressure medicine as prescribed. If side effects, cost or access are a problem, speak with the prescriber or pharmacist instead of stopping treatment. Some decongestants, pain medicines, stimulants and supplements may raise blood pressure or interact with treatment.
When high blood pressure is an emergency
A very high reading together with chest pain, severe breathing difficulty, confusion, fainting, sudden weakness, facial drooping, trouble speaking, sudden vision change or a severe unusual headache requires emergency assessment. Do not wait for an ordinary appointment or try to treat these symptoms with herbs.
Key takeaway
High blood pressure is often silent, but it is measurable and treatable. Use correct technique, keep a record, attend follow-up care and combine suitable lifestyle measures with prescribed treatment.
Measurement is the only reliable way to know
High blood pressure commonly causes no symptoms. Headache, dizziness, nosebleeds, or tiredness are not reliable screening tools and may have other causes. Regular, correctly performed measurements are needed to identify a problem and monitor treatment.
Technique affects the result
Use a validated upper-arm monitor with the correct cuff size. Avoid exercise, smoking, and caffeine shortly before measuring; empty the bladder, sit quietly, support the back and arm, keep feet flat, and do not talk during the reading. Follow the specific instructions provided by your clinician.
One reading is not usually a diagnosis
Pain, anxiety, illness, medicines, and poor technique can temporarily raise blood pressure. Diagnosis usually depends on repeated readings and may include home or ambulatory monitoring. Keep a dated record rather than repeating checks every few minutes because of worry.
Review medicines and health conditions
Kidney disease, sleep apnea, pregnancy, thyroid or adrenal conditions, and some medicines or supplements can affect blood pressure. Bring all products to a clinical review. Do not stop blood-pressure medicine suddenly or take another person’s treatment.
Warning signs require urgent care
Very high blood pressure with chest pain, severe breathlessness, weakness or numbness on one side, speech difficulty, confusion, fainting, vision loss, or a sudden severe headache requires emergency assessment. Pregnancy with severe headache, visual changes, upper abdominal pain, or sudden swelling also needs urgent care.
Preparing for a blood-pressure review
A record of readings is more useful than a single number. Write down the date and time, where the reading was taken, the device used, whether you were resting, and any symptoms or medicine changes. Bring your monitor and your list of prescribed medicines, non-prescription medicines, vitamins, and herbal products to an appointment. A clinician can check the cuff size and measurement technique, look for patterns, and decide whether further testing or treatment changes are needed.
Do not stop, double, or share blood-pressure medicine because of one home reading. Ask what reading range is appropriate for you, how often to check it, and when to contact the clinic. A very high reading with chest pain, severe shortness of breath, confusion, fainting, new weakness, trouble speaking, vision loss, or a sudden severe headache requires emergency assessment.
References
About the Author
Uche Flora Okonkwo, MPH, is the founder and writer of Wellness by Flora. She holds a Master of Public Health in Community Health and develops practical, evidence-informed health education to help readers make informed decisions.
Medical Disclaimer
This article provides general educational information. It is not a diagnosis or a substitute for individualized advice from a qualified healthcare professional. Do not stop or change prescribed treatment because of information on this website.
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