I've just considered the same conclusion that the OP did. A few details about me. I'm 33 years old— I'm a flamenco guitarist, so wrist twisting motions fast, loose, and fluid are typical in daily activity. I've never had an issue with tendentious, I'm very careful about my form for that reason. I've seen a surgeon, a GP, and a physical therepist. I have no injury to my shoulder, but I've had 4:10 pain daily in the medial deltoid that shoots down to my wrist. I've assumed it's something I've done, but no evidence of injury, just weakness, pain, and inflammation. It's even become difficult for me to get to sleep at night. I Have had an apple watch series one and now the Series 3. I believe in traditional medicine. I have been icing, and taking NSAIDs for my shoulder for a month. I stopped wearing my watch because It became difficult for me to put on a shirt on let alone a belt and a watch. Today I decided to put it on for the first time in a month and that's when this idea occurred to me to search the internet. The Dr. was perplexed when I told her that I had the same kinds of pain in my left shoulder a year ago. Now I have Pain in the right shoulder for the last 8 months. It was at that time that I switched my Watch from my left wrist to my right wrist. Why? so that I could skip songs while my hand stayed on my electric bike throttle on the right grip. I did not put a single ounce in the idea that some electronic voodoo was causing my issue— I have apple airpods, and use wireless controllers and I laugh at people that think that short waves are dangerous, I honestly don't think they are. I doubt that my cells are being damaged, but I don't doubt that my nerves may be confused by a signal(s) coming— all I know is I have real pain and no explanation. I'm not blaming the watch or EMR. Science probably has not had enough time to 'watch' this issue, and see if there is some portion of the user population that is hyper sensitive EMR. I love my apple watch, I love my airpods. And when my shoulder feels better again, I will be the first person to strap it back on my wrist, but if it hurts again. I will update my post and let everyone know. Mostly I came to share my specific symptoms in hopes of coordinating with others. I'll chime back in at some point in my healing process, and I will wear my watch again, even if it hurts me, but I'll let you all know.