I am 13 and last night a sudden pain in my chest came from nowhere. It is right underneath my right breast and hurts a little in the middle of my torso as well. It hurts mostly when I take a moderately deep to deep breath or if I just push my chest out. It kept me from sleeping last night until I took some Tylonal which made it tolerable to sleep with. I keep taking advil and such which eases the pain a bit. I dont know if its just muscle strain (I dont know when I would have strained it though I was doing nothing very physical at the time) or something more serious. I have no other symptoms like a cough or shortness of breath or any sort of increase in temperature, just the discomofort. Also, it feels much better when I take a hot shower, if that helps at all. Any feedback would be much appreciated, thank you.