The following is from the Vasculitis Foundation. I find it very interesting that there's no mention of muscles. They talk about the joints. I personally feel that PMR starts in the joints and the pain radiates out to the muscles. That's how it feels with myself. Any thoughts?
"Polymyalgia rheumatica (PMR) is an autoimmune disease that causes an inflammatory reaction affecting the lining of joints, especially the shoulders and hips, and sometimes the arteries and some major branches of the aorta."