What is white coat hypertension?

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White coat hypertension is the name for blood pressure that reads in the hypertensive range at the clinic but normal in daily life - driven by the alert response the medical setting triggers, sometimes without any conscious anxiety. It is common: estimates put it at 15 to 30 percent of people with high office readings. The mirror-image exists too - masked hypertension, normal at the office and high at home - and between them is the reason guidelines push out-of-office measurement before diagnosing or treating.

Does it matter? For years it was considered benign; newer evidence is more nuanced. NHLBI-supported research links sustained white coat hypertension to a modestly elevated cardiovascular risk compared with truly normal pressure - lower than true hypertension, higher than nothing. It also converts to sustained hypertension over time at an increased rate, which is why the recommendation is monitoring rather than dismissal.

The confirmation path: a week of proper home readings or a 24-hour ambulatory monitor - a cuff that measures you through a normal day and night, the gold standard. Confirmed white coat: lifestyle measures, repeat monitoring every 6 to 12 months, no medication in most guidelines. High everywhere: that is sustained hypertension, and the treatment conversation starts. Either way, the office reading alone is no longer enough to define you.

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