What should you know about high diastolic blood pressure?

High diastolic blood pressure means the pressure in your arteries remains elevated between heartbeats and should be assessed with repeated, properly taken readings. The diastolic value is the lower number in a blood pressure reading. One raised result can happen after activity, stress, caffeine, smoking, pain, or an unsuitable cuff, so it does not by itself establish a diagnosis.

Blood pressure is written as systolic over diastolic pressure. The systolic number reflects pressure as the heart contracts; the diastolic number reflects pressure while the heart relaxes and refills. A persistently high lower number can place ongoing strain on blood vessels and organs, even when the upper number is not raised. High blood pressure often causes no noticeable symptoms, which is why measurement matters. It can occur alongside factors such as excess weight, kidney disease, or obstructive sleep apnoea, and clinicians may review these possibilities with you.

Arrange a medical review if readings remain high or repeatedly show a raised diastolic value. Before measuring, rest quietly, keep both feet on the floor, support your arm, and use a correctly sized upper-arm cuff on bare skin. Avoid exercise, smoking, and caffeine shortly beforehand. Take two readings a minute apart and record the time, values, symptoms, and any medicines. Do not stop or change prescribed blood-pressure treatment without medical advice. Your clinician may confirm the pattern with home monitoring, clinic checks, or another assessment, then discuss lifestyle measures and treatment if needed.

Seek emergency help for a very high reading accompanied by chest pain, severe breathlessness, fainting, new weakness or numbness, trouble speaking, confusion, or a sudden severe headache. These symptoms can signal an emergency such as a stroke or heart problem and should not be explained away as ordinary high blood pressure. If a reading is unexpectedly high but you feel well, sit quietly and repeat it using good technique; contact a healthcare professional promptly if it stays high or you are unsure what to do.

Ask: Does my pattern suggest hypertension, and how should I monitor it at home? Could any medicine, supplement, sleep problem, kidney issue, or health condition be contributing? What target range applies to me? Which symptoms mean I should seek urgent help? How soon should my readings be reviewed?