The left side of my chest hurts and its most of the time sharp pain from deep breathes. Also feels very tight. The pain ranges from 2 in. below the clavicle and superficial to the left ventricle. Sometimes it radiates also to my back. It flares up too often and some of the time I get a very sharp pain in chest while singing in Choir and have to stop. Then my symptoms from above come back. However, the pain doesn't last more than 3-4 days. I think maybe I'm just pulling muscles in my chest but it happens a lot. Do you think it could be anything else? and If you agree, how would you go about treating it?