What high blood pressure readings mean

A high blood pressure reading needs careful repeat measurement and clinical context before it confirms hypertension. Blood pressure changes with activity, stress, pain, caffeine and the way the cuff is fitted. One result can prompt follow-up, but it does not by itself explain why the reading is raised.

The upper number is pressure when the heart contracts; the lower number is pressure while the heart relaxes. A clinician considers both, the pattern over time, and your overall health. Home readings may help reveal whether pressure stays high outside the clinic. Kidney disease, obesity, obstructive sleep apnoea and some medicines can affect blood pressure. Ongoing high pressure can strain blood vessels and organs, including the heart, brain and kidneys; it is associated with conditions such as Heart Failure and Stroke.

Sit quietly for several minutes, keep your back supported and feet flat, rest your arm at heart level, and avoid talking during the measurement. Use a correctly sized upper-arm cuff if possible, then record the date, time, reading and symptoms. Arrange a medical review if readings remain high or repeatedly rise. Do not stop prescribed treatment because a later result looks better. Bring your monitor, medicine list and recorded readings to the appointment.

Seek emergency help for a high reading accompanied by chest pressure, severe breathlessness, fainting, new weakness or numbness, trouble speaking, confusion, or sudden vision loss. These symptoms can signal an emergency such as Angina, Stroke or a transient ischaemic attack and should not be judged by the number alone. If the reading is unexpectedly high without warning symptoms, rest and repeat it correctly, then contact a healthcare professional promptly for advice.

Ask whether you need home monitoring, ambulatory monitoring, blood and urine tests, or a review of medicines and sleep. Also ask what reading or symptom should prompt same-day help, and when your next check should happen.