What is masked hypertension?
Last updated September 3, 2026.
Masked hypertension means normal office readings with high real-world readings: office under 140/90 but home or ambulatory readings of 135/85 or more. It is white-coat hypertension flipped, and sneakier, because a clean clinic number ends the conversation. Ambulatory-monitoring studies suggest it hides in roughly 10 to 15% of people with normal office pressure, and its cardiovascular risk tracks with sustained hypertension rather than with the reassuring office number. The typical carriers: smokers, heavy drinkers, the chronically stressed, people with diabetes or kidney disease, night workers, and anyone whose pressure surges outside clinic hours, especially overnight. Because the clinic cannot see it, detection depends on out-of-office measurement: validated home readings morning and evening, or a 24-hour ambulatory monitor, which is why current guidelines lean on those tools for borderline or high-risk patients. If your office numbers are always fine but you carry the risk profile, family history, night shifts, heavy snoring, request home or ambulatory monitoring by name. Masked hypertension is common, consequential, and completely treatable once someone actually looks for it.
What to do
- Know the numbers: office under 140/90 with home readings of 135/85+ is the pattern.
- Check your risk profile: smoking, stress, diabetes, kidney disease, night work, heavy snoring.
- Ask for out-of-office monitoring: a 24-hour ambulatory test is the definitive check.
- Log morning and evening readings: two weeks of home data beats one clinic number.
- Treat it if found: its risks match sustained hypertension, so it gets managed the same way.
Related questions
- What does high blood pressure mean?
- How do I take my blood pressure correctly?
- How to lower blood pressure naturally
- Online doctor blood pressure medication