Possibly but I’ve done workout and haven’t seen any connection to the pain during or after. I do have some tight muscle in back and neck and often crack my joints so so much so there may be a muscle tightness issue going on. And regarding your next response I’m unsure about gelatin I’ve tried that and collagen before and it ruined my gut. I’ve had small amounts of glycine but I’m unsure about that too due to things I’ve read about it and genetics so I stay cautious and have never properly experimented with it. And your last response I can see that making sense with the inflammation as let’s say it is inflammation any trigger in poor gut health or stress could definitely cause an episode by raising inflammation.Very odd that all three of you get the same pain. I wasn't familiar with costochondritis before, but you may have solved a puzzle for me. I think I may have developed that as a result of my former yoga practice. My pain would come in waves periodically and affected my right side, right up to my jaw. After the first time I knew it was muscle-related, as it seemed connected to an extremely tight muscle in my back. Do you all do any kind of smilar exercise? It could be stress causing tight muscles and inflammation, as I think that also played into my muscle issues.