Can an Apple Watch detect AFib?
Last updated September 3, 2026.
Yes - the FDA cleared the Apple Watch ECG app to detect atrial fibrillation, and a second feature flags irregular pulse rhythms suggestive of AFib. A notification means the watch found a pattern consistent with AFib and the next step is a doctor who confirms it with a medical-grade ECG. It is a screening layer, not a diagnosis - and a silent watch does not clear new palpitations or dizziness, since it samples rather than monitors continuously.
What to do
- Take a notification to a doctor. Untreated AFib raises stroke risk - confirmation and treatment are the point.
- Export the ECG. The watch saves a PDF your doctor can read.
- Do not panic over one alert. Other rhythm quirks occasionally trip it; the medical ECG sorts truth.
- Report symptoms even with a quiet watch. Sampling is not continuous monitoring.
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