An analysis of 2021-2023 National Health and Nutrition Examination Survey (NHANES) data found that among nonpregnant adults with hypertension (defined as systolic blood pressure 130 mm Hg or higher, diastolic blood pressure 80 mm Hg or higher, or use of antihypertensive medication), nearly 80% had a mean of three blood pressure (BP) measurements higher than 130/80 mm Hg. Of this group with uncontrolled BP, based on some practice guidelines , fewer than 40% were taking antihypertensive medications. Although undertreatment of high BP may result from therapeutic inertia , many adults do not have a regular source of care and simply do not know that they have hypertension. Identifying undiagnosed hypertension is the goal of the Apple Watch’s hypertension notification feature, which was cleared in September 2025 by the US Food and Drug Administration for use in nonpregnant people 22 years or older. The watch is not a substitute for a home BP monitor , and it does not provide individual B...