High and Low Blood Pressure Effects on the Body
Content updated: · OUSON Care
Blood pressure changes throughout the day. The meaning of a reading depends on the pattern, your symptoms and your medical circumstances, not just a coloured indicator on a monitor.
How can high blood pressure affect the body?
High blood pressure often has no obvious symptoms. Over time, it puts extra strain on blood vessels and organs. Untreated hypertension can increase the risk of heart attack, stroke, heart failure and kidney disease. Feeling well does not tell you whether your blood pressure is controlled.
Diagnosis and treatment targets should come from your healthcare professional. Clinical and home readings can be assessed differently; one result is not a complete diagnosis. The NHS high blood pressure guide explains assessment and long-term risks.
Does low blood pressure always mean something is wrong?
No. Low blood pressure may cause no symptoms in some people. It can also be associated with dizziness, blurred vision, weakness or fainting. Repeated symptoms, particularly when standing up, need medical advice. Medicines and other conditions can contribute, so do not change treatment on your own.
The NHS describes a reading below 90/60 mmHg as low blood pressure, but the number alone does not establish its cause or whether it needs treatment. Read more about low blood pressure.
Make your readings easier to review
Bring your actual readings to an appointment. Include dates, times, both pressure numbers, pulse and any symptoms. Also note which device and cuff you used. This gives your care team a clearer record than remembering only the highest or lowest result.
If a value looks unusual, check the technique and follow your clinician's monitoring plan. Do not take repeated measurements until a preferred number appears or delete results you dislike.
When should you seek urgent help?
A systolic reading above 180 or a diastolic reading above 120 needs prompt attention. Without emergency symptoms, wait at least one minute, repeat the measurement and contact a healthcare professional immediately if it remains that high. With chest pain, breathlessness, new weakness or speech changes, call 999 in Malaysia immediately. Do not wait for a repeat reading. See the American Heart Association's guidance on very high readings.
General information for adults. This article does not diagnose a condition or replace advice from your healthcare professional.
Sources
- NHS: High blood pressure
- NHS: Low blood pressure
- American Heart Association: Understanding Blood Pressure Readings
- Ministry of Health Malaysia: emergency response through 999
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