I am a 16 year old female that plays basketball and soccer and for the past year I would get a pain under my left breast from walking around the mall. btw I have gone to physio for my back pain that I get all day everyday. a couple months ago this pain in my chest would occur everyday, mainly when I was sitting for a long period of time. I feel as if I need to stretch it out but that hurts and it feels like a bruise to touch but no external signs. I got an x Ray and it was fine. it is an achy pain and every once and a while it will be a sharp pain and I have a hard time breathing for a couple minutes because it hurts. I am 99% sure I haven't had any trauma to this area. I would love some feed back