Google AI Detects Hypertension From a Regular Smartwatch, Catching 65.8% vs 55.3% for Cuff

emmanuelvivier · x · 2026-11-08

A Google Research AI can detect signs of high blood pressure using a regular smartwatch, with no cuff needed for calibration, relying only on the pulse and motion sensors already in modern watches. The study was published in Nature.

Method: A neural network learned from nearly 500,000 hours of sensor data by comparing short segments to infer which belonged to the same person, picking up typical pulse and heartbeat patterns without diagnosis labels. It then averages patterns over several days to compute a hypertension probability.
Results: In a 196-person study across five US sites, the watch identified 65.8% of people with high blood pressure, versus 55.3% for standard in-office measurement.
Deployment: Google says findings are folded into the blood pressure trends feature in the Google Health app, but the method remains a research project and does not replace diagnosis; the goal is to nudge people to get checked. More than half of people with hypertension don't know they have it.

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Google AI Detects Hypertension From a Regular Smartwatch, Catching 65.8% vs 55.3% for Cuff

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