What should you know about masked and white coat hypertension?

White coat hypertension describes a higher reading in a healthcare setting than during usual daily life. Anxiety or alertness around an appointment may contribute, although the pattern still needs proper assessment. Masked hypertension is the reverse: a clinic reading may look lower while pressure is higher at home, work, or during routine activity. Neither pattern can be identified reliably from one appointment reading. Generalised anxiety disorder may affect how anxiety is experienced, but anxiety alone should not be assumed to explain every elevated measurement. Repeated readings outside the clinic help clinicians decide whether monitoring or treatment is needed.

Use a validated home monitor if your clinician recommends one, with the correct cuff size and a consistent technique. Sit quietly with your back supported and arm resting, then record readings with the time and relevant circumstances. An ambulatory blood pressure monitor can take readings across ordinary daytime and night-time activities, giving a fuller picture than an appointment snapshot. Bring your log and monitor to review if requested. Do not start, stop, or alter blood-pressure medicine based on a single home or clinic result.

Seek emergency care for a very high reading accompanied by chest pain, severe breathlessness, weakness on one side, difficulty speaking, severe headache, confusion, or changes in vision. If a high result has no serious symptoms, sit quietly and repeat it using correct technique, then contact a clinician for advice when it remains raised. A lower reading does not rule out masked hypertension or remove the need for planned monitoring.

Should I use home readings or ambulatory monitoring? How many readings should I record and at what times? Could my cuff, posture, medicines, or appointment anxiety affect the result? What symptoms or readings should trigger urgent action?