I noticed a strange heartbeat. It almost felt like it missed a beat followed by an unusually strong beat. I was working with a cardiologist last year. They're not life threatening or dangerous. In fact, he said that there are meds that can be given to minimize the symptoms (weird beats as described above) but if I wasn't bothered by them then he wouldn't prescribe the meds. He wasn't an AME but he was fairly sure that those meds would cause some issues with a flying physical so I opted out.

Mine are fairly minor. I notice them mostly after a workout or if I have a lot of caffeine.