I have frequent ectopic beats that I feel as a flutter / heavy beat on my chest. The doc says it won't kill me but it is extremely uncomfortable at times. This has been a great material to learn about the inner workings of heart cells.
BTW Here's an ECG from my Apple Watch showing 3 such beats (you can't miss them): https://link.ekin.dev/l1Vc3Gdf
If you happen to have these, just get checked out by a cardiologist. They are almost always benign but the frequency / daily amount are reasons for concern.
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