For being only 30, I'm a broken, broken man. I want to see if anybody else has had similar problems to this, and what they did to fix it: Twice now in the past 2 years, I've pulled/strained a muscle in my upper back. I'm pretty sure it's the Serratus Posterior Superior; the pain is centered just above the shoulder blade, and a bit towards the spine. When I pull the muscle, it ends up in extreme pain (I kid you not, I prefer having a migraine to this pain) in that spot & radiating out to my arm, and then lowering amounts of pain over more than a month. I've been fighting various amounts (typically low, except after a strain) of pain in this area for years due to guitar/bass playing. I even spent $150 on a thick, padded, leather, double-shoulder strap (http://www.gruvgear.com/duostrap) which helps, but obviously is not enough. I get massages (from a great, therapeutic therapist), I've done PT, my "normal" MD doc hasn't done anything but give me good drugs for when I'm in extreme pain, I do self-trigger point therapy, stretching, yoga, etc. etc. All of this has led me to being nearly pain-free there for a few weeks. Last night, I had a 2-hour gig. Today, I did yoga. About 1 hour after yoga, I looked at my PC wrong & pulled the muscle again. Anybody ever had anything like this? This seems more specific/serious than just "my shoulder hurts when I play." Am I just doomed to ALWAYS sitting while I play because my body just can't handle standing? I admit, I play fairly heavy instruments, but the weight is almost perfectly evenly split between both shoulders, and my issues are ONLY in the left shoulder (I'm a right-handed player). Help?