I've recently noticed that when I yawn, I feel a sharp pulling/pinching (what I used to call a pinched nerve) in my upper left chest near my armpit. I do exercise using weight machines, but not as regularly as I should. I typically lift only 24 lbs for arms and chest. I noticed the pain/sensation about two weeks ago. Then this morning I was aware that it was more pronounced. When I take a deep breath, I feel the pain in that area of my chest, but toward my left armpit. I also poked at the muscle just in from my underarm, above and to the left of my left breast. I got a strange sensation, not pain, but a weird "numb" feeling. Very hard to describe. I am concerned about what it could be.
Thank you.
Thank you.