A few days ago, I noticed that I couldn't lie comfortably on my side when falling asleep because there was some pain in my mid back, on the left side by the spine, that I felt more when I was inhaling. I could feel it with my hand, as if it was a very large muscle knot or something (about 3-5 inches along the spine). I had my boyfriend rub it for a while and this felt good, but did not ease the symptoms permanantly. Yesterday I did some very light yoga and now I feel it on both sides. It increases when i bend forward or twist side to side. I have bad allergies and some environment-induced athsma so it's possible that it is a lung related issue, but feels more musculatory. I also sit at a desk all day. I am 23 years old. What could this be and how can I ease the symptoms?