Theref...hi. I have had a hard time underdstanding my pain and wondered if.it was PMR or one of my other autoimmune gigs. I kind of understand what you are saying that the pain might be moving around so to speak. I think it can feel like that and sometimes it's from what activities you have done and how your body moves when affected by pain. Once you compensate for pain sometimes pain pops up in different and new places from muscles etc being used differently. I have had pain every day but each day the degree is different or it presents differently. So my shoulder and upper arm have been painful then one day my elbow and lower arm....OY! Also each day the areas involved "play at different volumes" so my back pain can drown out my arm. Then....I hope that makes sense. I will say I have learned a lot here and had to see I have problems with the typical PMR plain targets....and PMR affects the muscles not joints. I also see that we might each have non traditional areas that hurt. At the beginning my hands did me in. So not sure any.of that sounds right but I wanted to respond. Good luck.
Be well. Mickie