Upper arm muscle pain on raising it upwards on the side. Pinched nerve? Knotted !

Upper arm muscle pain on raising it upwards on the side. Pinched nerve? Knotted muscle?

For some time I have had pain when raising up my right arm out to the side (but NOT when I raise it in FRONT of me). I am thinking I may have a pinched nerve or knotted muscle in my shoulder or neck or upper back somewhere (I often sleep on my right side). Any expert out there know which muscle or nerve it might be, or have any other suggestions? I had this on my left side years ago but was not happy with the treatment I reiceived because it only got much worse until I couldn't lift my arm at all (at which point they had to resort to a cortisone shot) ! So I hesitate to engage the formal medical community on this issue. Thanks for any suggestions, info.

I had the same problem about 2 years ago. It is a knotted muscle and the best thing to do is to go to a licensed massage therapist. They will massage it out for you and give you exercises to do on your own to keep knotted muscles from forming. I got mine from lifting weights and sometimes it got so bad that I had to go to the ER that I was in so much pain, and the doctors didn't know what was wrong. But I tried a massage therapist and he knew exactly what it was!