how to find historical irregular rhythm notifications

Hello Christine Kobayashi,

Thanks for reaching out in Apple Support Communities. Knowing where to find your health data is important.

You will want to look at the article Take an ECG with the ECG app on Apple Watch, and scroll down to the section “View and share your Health information”. 

If you have further questions, you will want to reach out to Apple’s dedicated Health Support Advisors. They can be reached by going to Get Support.

Let us know anytime you have questions.

Take care!