The feature works on Apple Watch Series 9, 10 and 11, plus Ultra 2 and 3, and requires an iPhone 11 or later running iOS 26.
Users must enable it in the iPhone Health app, be aged 22 or older, have Wrist Detection on, and not be pregnant or previously diagnosed with hypertension.
Apple says the watch uses optical heart sensor data and needs 30 days of initial monitoring before sending notifications about possible hypertension patterns.
With studies showing it may miss most hypertension cases, can users truly rely on their Apple Watch for health security?
Your health data isn't HIPAA-protected, so who can access your watch's blood pressure patterns and how might they use that information?