For about two years now I have had pain on the left side of my upper back primarely when taking a deep breath. At first I thought it was muscle related, but now I think it is lung related or nerve related. I am currently going to a pain management clinic, where they have done trigger point injections, but that is it. Next visit they are doing an intercostal nerve block injection. This may or may not help, but i still think something else is the cause of this cronic pain. It is not a sever pain, but rather a tension or pressure pain. Can someone help me with this concern?