Severe white coat hypertension: what to know

Anxiety, pain, rushing, a full bladder, talking or an incorrectly sized cuff can raise a clinic reading. White coat hypertension describes a difference between readings in a healthcare setting and readings during usual activities; it does not mean every high result is harmless. Blood pressure may also be high outside the clinic without obvious symptoms. Anxiety can contribute, including symptoms associated with [Generalised Anxiety Disorder](/conditions/generalised-anxiety-disorder/), but a high reading should be assessed on its own terms. The pattern is clarified with careful home readings or [Ambulatory Blood Pressure Monitoring](/treatments/diagnostics-and-screening/ambulatory-blood-pressure-monitoring/).

Before a measurement, rest quietly, support your back and arm, keep both feet on the floor and avoid talking. Take readings exactly as your clinician advises, using a validated upper-arm device and a correctly fitting cuff. Record the time, reading, symptoms, caffeine or exercise and any medicine taken. Never change or stop blood-pressure medicine because one reading is high or normal. Bring the monitor and record to review so technique can be checked. A clinician may compare clinic results with home or ambulatory monitoring before deciding on follow-up.

Call emergency services for a very high reading accompanied by chest pain, severe breathlessness, fainting, new weakness or numbness, trouble speaking, confusion, or a sudden severe headache or vision change. Sit quietly and repeat a reading only if this does not delay help. A high reading without symptoms still deserves prompt medical advice, particularly when it remains elevated or you have known cardiovascular or kidney disease. Do not dismiss a marked result as anxiety alone.

Ask whether your technique and cuff are suitable, how often to measure at home, whether ambulatory monitoring is appropriate, what your target range is, how medicines affect readings, and which symptoms should trigger emergency help.