On a compatible Apple Watch, turn on irregular rhythm notifications from your iPhone: Health → Search → Heart → Irregular Rhythm Notifications → Set Up. Complete the age, AFib-diagnosis, and notification prompts.
Before starting, confirm that the feature is available in your country or region, both devices are updated, you are at least 22, you have not been diagnosed with AFib, and AFib History is not enabled. Apple Watch checks periodically for patterns suggestive of AFib; it does not continuously monitor your heart or diagnose AFib.
As an Amazon Associate I earn from qualifying purchases.
Before you begin
- Apple Watch: Apple’s regulatory instructions list Apple Watch Series 3 or later, subject to regional and software availability. Check Apple’s current compatibility information if you are unsure.
- Software: Update the iPhone and Apple Watch to the latest available versions.
- Age: Apple says the feature is not intended for people under 22.
- Diagnosis: Irregular Rhythm Notifications are intended for people who have not been diagnosed with AFib. If you already have AFib, discuss Apple’s AFib History feature and monitoring options with your clinician.
- AFib History: It must not be enabled. Setting up AFib History can automatically turn off irregular rhythm notifications.
- Region: Apple’s heart-health features are not available in every country or region.
Apple’s official regulatory instructions identify Series 3 or later as compatible with the Irregular Rhythm Notification Feature, but model, region, and software requirements can differ. See the official instructions if the option does not appear.
The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →How to turn on irregular rhythm notifications
- On your iPhone, open the Health app.
- Tap Search.
- Tap Heart.
- Tap Irregular Rhythm Notifications.
- Tap Set Up.
- Follow the prompts. You will be asked to confirm your age, state whether a physician has diagnosed you with AFib, review information about the feature, and enable notifications.
Menu labels can vary slightly by iOS version or region. The Health app route is the most dependable current path. The Apple Watch user guide also describes starting setup from Apple Watch app → My Watch → Heart → Set Up Irregular Rhythm Notifications in Health.
#1 Best Overall
![Apple Watch Series 11 [GPS 46mm] Smartwatch with Jet Black Aluminum Case with Black Sport Band - M/L. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/416RQ0rtsUL._SL160_.jpg)
- A FULL-FEATURED HEALTH TRACKER—Apple Watch Series 11 gives you invaluable insights about your body, right from your wrist. Take an ECG anytime* and get alerts for a high and low heart rate or an irregular rhythm*—so you can stay closer to your heart. You can also view your overnight health tracking metrics with the Vitals app* and be notified of possible sleep apnea.*
- KNOW YOUR SLEEP SCORE—With advanced sleep tracking, Series 11 gives you a daily sleep score. It’s an easy way to help measure and understand the quality of your sleep, so you can make it more restorative.
- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
- SAFETY FEATURES—A smartwatch that puts your safety first. Series 11 can detect a hard fall or severe car crash, automatically help connect you with emergency services, and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- A POWERFUL FITNESS TRACKER—With advanced metrics and motivating features like Pacer, Heart Rate Zones, training load, and Workout Buddy powered by Apple Intelligence from your nearby iPhone*—Series 11 is made to help everyone stay active, from runners and hikers to strength-training enthusiasts.
How to check or turn off the setting later
After setup, manage the feature from:
iPhone → Apple Watch app → My Watch → Heart → Irregular Rhythm
From there, you can check whether irregular rhythm notifications are enabled and switch them off if necessary. Turning the feature off does not affect the separate ECG app or other heart measurements.
What irregular rhythm notifications actually do
The feature examines pulse data periodically for a pattern that may suggest atrial fibrillation, or AFib. It often attempts readings when you are relatively still because movement can interfere with pulse measurements. The watch may need multiple readings before sending an alert.
An alert means Apple Watch identified and confirmed a pattern suggestive of AFib. It is not a definitive diagnosis, and some irregular rhythms may have causes other than AFib. Apple also says the feature is not continuously checking and cannot detect every instance of AFib.
Rank #2
![Apple Watch Series 11 [GPS 42mm] Smartwatch with Rose Gold Aluminum Case with Light Blush Sport Band - S/M. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/31caPPnRysL._SL160_.jpg)
- A FULL-FEATURED HEALTH TRACKER—Apple Watch Series 11 gives you invaluable insights about your body, right from your wrist. Take an ECG anytime* and get alerts for a high and low heart rate or an irregular rhythm*—so you can stay closer to your heart. You can also view your overnight health tracking metrics with the Vitals app* and be notified of possible sleep apnea.*
- KNOW YOUR SLEEP SCORE—With advanced sleep tracking, Series 11 gives you a daily sleep score. It’s an easy way to help measure and understand the quality of your sleep, so you can make it more restorative.
- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
- SAFETY FEATURES—A smartwatch that puts your safety first. Series 11 can detect a hard fall or severe car crash, automatically help connect you with emergency services, and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- A POWERFUL FITNESS TRACKER—With advanced metrics and motivating features like Pacer, Heart Rate Zones, training load, and Workout Buddy powered by Apple Intelligence from your nearby iPhone*—Series 11 is made to help everyone stay active, from runners and hikers to strength-training enthusiasts.
Likewise, receiving no alert does not prove that your rhythm is normal. The watch may not have been checking during an episode, may not have obtained a reliable reading, or may not identify the particular rhythm or condition involved.
What to do if you receive an alert
- Read the notification and note when it appeared.
- If you have not been diagnosed with AFib, arrange a medical evaluation and show the notification to your clinician.
- If your watch supports the ECG app and you are having symptoms, record an ECG while the symptoms are occurring and save or share the result with your clinician.
- Do not start, stop, or change medication based only on a watch alert. Discuss medication with a healthcare professional.
The ECG app is a separate, user-initiated recording that takes about 30 seconds. Apple Watch cannot detect a heart attack or stroke. Seek emergency help for chest pain or pressure, severe shortness of breath, fainting, or possible heart-attack or stroke symptoms. Do not wait for another watch notification.
Irregular Rhythm Notifications vs. ECG vs. AFib History
| Feature | Intended use | How it works | Does it send an AFib-style alert? |
|---|---|---|---|
| Irregular Rhythm Notifications | People not diagnosed with AFib | Periodic background screening for a rhythm suggestive of AFib | Yes, if a qualifying pattern is identified and confirmed |
| ECG | Eligible users who want a recording | User-initiated, approximately 30-second single-lead ECG | No background alert; you start each recording |
| AFib History | People already diagnosed with AFib | Retrospective estimates and trends of AFib burden | No; Apple says it does not notify you when you are experiencing AFib |
The ECG app requires Apple Watch Series 4 or later or any Apple Watch Ultra, subject to regional availability. It is not supported on Apple Watch SE or Apple Watch For Your Kids. You do not need the ECG app for irregular rhythm notifications, and ECG availability does not by itself prove that irregular rhythm notifications are available on a particular watch.
Crashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteWindows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallApple’s reported ECG validation figures—98.3% sensitivity for AFib and 99.6% specificity for sinus rhythm among classifiable recordings—apply to the ECG app’s controlled validation, not to background irregular rhythm notifications or every real-world reading.
Rank #3
![Apple Watch SE 3 [GPS 40mm] Smartwatch with Starlight Aluminum Case with Starlight Sport Band - S/M. Fitness and Sleep Trackers, Heart Rate Monitor, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/31YiTby0pOL._SL160_.jpg)
- GET SMARTER HEALTH INSIGHTS—Apple Watch SE 3 is an advanced health tracker that helps you better understand your body. The smartwatch sends alerts for an irregular heart rhythm, or an unusually high or low heart rate.* You can view your overnight health tracking metrics with the Vitals app,* track your sleep score, and get sleep apnea notifications.*
- A GREAT FITNESS TRACKER—SE 3 can track your workouts in a healthy number of ways—from running and strength training to simply achieving your 10K steps a day. With real-time metrics and Workout Buddy powered by Apple Intelligence from your nearby iPhone,* you’ll hit your goals like never before.
- KEEP HELP CLOSE AT HAND—SE 3 is a smartwatch that can detect a hard fall or severe car crash and automatically help connect you to emergency services and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- WOMEN’S HEALTH INSIGHTS—SE 3 has advanced sensors that track your wrist temperature while you sleep. With this smartwatch, you can log your periods and symptoms, get period predictions, and get notified of cycle deviations.*
- GREAT BATTERY LIFE AND FASTER CHARGING—Enjoy a smartwatch with all-day, 18-hour battery life* from sunup to sundown. Then charge up to twice as fast as SE 2* and get up to 8 hours of battery in just 15 minutes.*
Why the option is missing
Check these possibilities in order:
- Region: The feature may not be approved or available where you live. Apple’s health features vary by country and region.
- Software: Update both the iPhone and Apple Watch, then reopen the Health app.
- Age: The setup flow is not intended for people under 22.
- Existing AFib diagnosis: Apple does not design this feature for people already diagnosed with AFib.
- AFib History: If it is enabled, irregular rhythm notifications may have been turned off automatically. Do not disable a clinician-recommended setting simply to restore alerts.
- Watch model: Verify the model against Apple’s current compatibility information. Series 3 or later is listed in Apple’s regulatory instructions, but regional and software restrictions still apply.
- Pairing and permissions: Confirm that the watch is paired normally with the intended iPhone and that Health setup and permissions are complete.
Why notifications may not arrive
No alert can have several explanations. The watch checks periodically rather than continuously; you may not have worn it consistently; the band may have been loose; movement may have prevented a reliable reading; or the rhythm may not have met Apple’s detection and confirmation conditions.
Also check whether Low Power Mode is enabled. Apple says Low Power Mode turns off high-heart-rate, low-heart-rate, and irregular-rhythm notifications. A missing alert does not rule out AFib or another heart condition.
If you need monitoring that is more continuous or clinically directed because of recurring symptoms, ask a clinician whether an ambulatory ECG or medical patch monitor is appropriate. Apple Watch’s background feature is not a replacement for diagnostic monitoring.
Quick wins for a faster PC:
Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →If you already have AFib
Irregular Rhythm Notifications are not intended for people with an existing AFib diagnosis. Apple’s AFib History feature is designed for diagnosed users and provides retrospective estimates of AFib burden rather than an alert when an episode begins.
Rank #4
![Apple Watch SE 3 [GPS 40mm] Smartwatch with Midnight Aluminum Case with Midnight Sport Band - S/M. Fitness and Sleep Trackers, Heart Rate Monitor, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/31Gq8SToFJL._SL160_.jpg)
- GET SMARTER HEALTH INSIGHTS—Apple Watch SE 3 is an advanced health tracker that helps you better understand your body. The smartwatch sends alerts for an irregular heart rhythm, or an unusually high or low heart rate.* You can view your overnight health tracking metrics with the Vitals app,* track your sleep score, and get sleep apnea notifications.*
- A GREAT FITNESS TRACKER—SE 3 can track your workouts in a healthy number of ways—from running and strength training to simply achieving your 10K steps a day. With real-time metrics and Workout Buddy powered by Apple Intelligence from your nearby iPhone,* you’ll hit your goals like never before.
- KEEP HELP CLOSE AT HAND—SE 3 is a smartwatch that can detect a hard fall or severe car crash and automatically help connect you to emergency services and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- WOMEN’S HEALTH INSIGHTS—SE 3 has advanced sensors that track your wrist temperature while you sleep. With this smartwatch, you can log your periods and symptoms, get period predictions, and get notified of cycle deviations.*
- GREAT BATTERY LIFE AND FASTER CHARGING—Enjoy a smartwatch with all-day, 18-hour battery life* from sunup to sundown. Then charge up to twice as fast as SE 2* and get up to 8 hours of battery in just 15 minutes.*
Use the feature your healthcare professional recommends, and do not change treatment or monitoring based solely on Apple Watch data.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.If you have symptoms but no alert
Do not wait for the watch. Palpitations, a rapid or fluttering heartbeat, dizziness, fainting, chest pain, or shortness of breath deserve medical judgment even if no notification appears. For chest pain, pressure, tightness, severe breathing difficulty, fainting, or possible heart-attack or stroke symptoms, contact emergency services immediately.
Frequently asked questions
Does Apple Watch continuously monitor for AFib?
No. Irregular rhythm notifications use periodic checks and cannot identify every episode.
Can Apple Watch diagnose AFib?
No. An alert identifies a pattern suggestive of AFib and should be followed by medical evaluation.
Best Value
![Apple Watch Series 11 [GPS 42mm] Smartwatch with Jet Black Aluminum Case with Black Sport Band - S/M. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/41s72HIk5TL._SL160_.jpg)
- A FULL-FEATURED HEALTH TRACKER—Apple Watch Series 11 gives you invaluable insights about your body, right from your wrist. Take an ECG anytime* and get alerts for a high and low heart rate or an irregular rhythm*—so you can stay closer to your heart. You can also view your overnight health tracking metrics with the Vitals app* and be notified of possible sleep apnea.*
- KNOW YOUR SLEEP SCORE—With advanced sleep tracking, Series 11 gives you a daily sleep score. It’s an easy way to help measure and understand the quality of your sleep, so you can make it more restorative.
- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
- SAFETY FEATURES—A smartwatch that puts your safety first. Series 11 can detect a hard fall or severe car crash, automatically help connect you with emergency services, and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- A POWERFUL FITNESS TRACKER—With advanced metrics and motivating features like Pacer, Heart Rate Zones, training load, and Workout Buddy powered by Apple Intelligence from your nearby iPhone*—Series 11 is made to help everyone stay active, from runners and hikers to strength-training enthusiasts.
Do I need the ECG app?
No. Irregular rhythm notifications and ECG are separate features. ECG can provide a user-initiated recording on supported models and in supported regions, but it is not required for background notifications.
Does Apple Watch SE support irregular rhythm notifications?
Do not assume that ECG and irregular rhythm support are identical. Apple specifically excludes Apple Watch SE from ECG support; check Apple’s current regional and model-specific compatibility information for irregular rhythm notifications.
Is the feature available in every country?
No. Availability depends on country or region, regulatory approval, watch model, and software.
Crashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteWindows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallBottom line
Use Health → Search → Heart → Irregular Rhythm Notifications → Set Up to enable the feature, then manage it in Apple Watch → My Watch → Heart → Irregular Rhythm. Treat an alert as a prompt for medical follow-up—not a diagnosis—and never interpret the absence of an alert as proof that your heart rhythm is normal.
Frequently Asked Questions
Why did AFib History turn off irregular rhythm notifications?
Apple treats the two features as different tools: Irregular Rhythm Notifications are intended for people without an AFib diagnosis, while AFib History is intended for diagnosed users. Enabling AFib History can automatically turn off irregular rhythm notifications.
Can I use irregular rhythm notifications if I need continuous monitoring?
No. The feature checks periodically. If recurring symptoms require continuous or clinically directed monitoring, ask a healthcare professional about an ambulatory ECG or patch monitor.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
