Track your Afib History with Apple Watch

Find out how to set up Afib History to track how frequently your heart shows signs of Afib and log life factors that can impact your condition. 

About Afib and Afib History

Atrial fibrillation (Afib) is a type of irregular heart rhythm where the upper chambers of the heart beat out of sync with the lower chambers. 

According to the CDC, approximately 2% of people under the age of 65 and 9% of people aged 65 and older have Afib. Irregularities in heart rhythm become more common as people get older. Some individuals with Afib don't experience any symptoms. Others experience symptoms such as a rapid heartbeat, palpitations, fatigue or shortness of breath.

Afib is a chronic condition, but the amount of time people spend in Afib can change. People with Afib often live healthy, active lives. The amount of time your heart is in Afib can potentially be reduced with regular exercise, a heart-healthy diet, a healthy weight and treatment of other medical conditions that could worsen Afib. If left untreated, Afib can lead to heart failure or blood clots that may lead to a stroke.

Afib History gives long-term visibility into the amount of time your heart shows signs of Afib, also known as Afib burden, so you can share this information with your doctor for richer conversations.

Here’s what you’ll need

An iPhone that shows the How Afib History Works setup screen 

Set up Afib History

  1. On your iPhone, open the Health app.
  2. Tap Browse, then tap Heart.
  3. Tap Afib History.
  4. Tap Set Up, then tap Get Started.
  5. Enter your Date of Birth.
  6. Select Yes to indicate that you have been diagnosed with Afib by a doctor, then tap Continue.
  7. Tap Continue to find out more about Afib History, the results you may see and life factors.
  8. Tap Done.

Log Life Factors

Afib History periodically checks your heart rhythm for signs of Afib. Although Afib can occur at any time, there are factors that may impact the percentage of time your heart shows signs of Afib for the previous week. Afib History looks at the following life factors that can impact the percentage of time your heart is in Afib:

  • Exercise Minutes
  • Sleep
  • Weight
  • Alcohol Consumption
  • Mindful Minutes

If you wear your Apple Watch consistently when you work out, sleep or meditate, your Exercise Minutes, Sleep and Mindful Minutes will be logged automatically. You can tap each life factor, then tap Log to manually log the details. You can also tap a suggested third-party app to download from the App Store to track each factor.

View your Afib History estimate

After gathering enough readings, every Monday you'll receive weekly alerts on your Apple Watch with the estimated percentage of time your heart showed signs of Afib from the previous week. You can also view your history in greater detail in the Health app.

An iPhone showing a sample Afib History graph with the Sleep Life Factor selected 

  1. On your iPhone, open the Health app.
  2. Tap Browse, then tap Heart.
  3. Tap Afib History. If you have Afib History saved to your Favourites, you can also access it from the Summary tab.

Your Afib History estimate appears as a percentage. A lower percentage means your heart was in Afib less often, while a higher percentage means more often. Your Afib History will never be displayed as 0%. Instead, it will be displayed as 2% or less.

You can also tap Show Life Factors to compare a Life Factor with your Afib History.

View your Afib History Highlights

Afib History Highlights show you the day of week and time of day your heart is most frequently showing signs of Afib. This can help you assess how life factors may be impacting your condition. Afib History Highlights become available after 6 weeks of wearing your Apple Watch and gathering enough readings.


  1. On your iPhone, open the Health app.
  2. Scroll to Highlights.
  3. Tap Afib History.

Share your Afib History

If you're set up to share your health data in the Health app, family and friends can receive updates on your Afib History. If you live in the United States, you can also share your Afib History automatically with enrolled healthcare providers. Find out more about how to share and view health data in the Health app.

You can also export your Afib History data to a PDF to share. From Afib History, scroll down to Options and tap Export PDF. Tap the Share Button to send the PDF to someone in your Contacts, save to the Files app or AirDrop to another device.

Things you should know

  • Low Power Mode turns off background heart measurements and may lead to no Afib History estimates if enabled. Find out more about Low Power Mode.
  • Apple Watch cannot detect a heart attack or stroke. If you ever experience chest pain, pressure, tightness or what you think is a heart attack, call the emergency services immediately.
  • Apple Watch only checks for signs of atrial fibrillation periodically. Afib History may not find every instance of your irregular rhythm.
  • Afib History will not notify you when you're experiencing Afib.
  • Do not change your medication without talking to your doctor.
  • Since the irregular rhythm notifications feature is not intended for people with Afib, it will be turned off automatically when you set up Afib History.

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