I'm one of the firm believers that the Mirena IUD causes some of us to have an autoimmune response to the silicone. Our confused immune system tries to "attack" the foreign body and instead attacks muscles, joints, and tendons. We end up with all kinds of migrating pain that mimics autoimmune diseases such as Rheaumatoid Arthritis, Lupus, Multiple Sclerosis, fibromyalgia, etc. Some of us end up with damaged thyroid glands (another autoimmune disease) and require meds for the rest of our lives. I've had migrating pain in my feet, knees, hips, groin, hands, neck, jaw, wrists, elbows, shoulders, and various muscles. Sometimes there's clicking. Sometimes there's weakness. Sometimes it feels like tendonitis. I'm about 6 months post removal of the evil device. I think I can finally say I'm getting better. The episodes are less frequent and less severe. I've read this type of autoimmune response can burn itself out with time. I'm hoping for continued improvement. Wishing all of you good health...