How do polymyositis and dermatomyositis develop?
Polymyositis and dermatomyositis are autoimmune diseases. In both conditions the immune system malfunctions and produces antibodies that attack healthy tissue in different parts of the body. Polymyositis and dermatomyositis are classified as connective tissue diseasesdisorders featuring abnormalities involving the collagen and elastin. Polymyositis and dermatomyositis are characterized by painful inflammation and degeneration of the muscles. The weakness usually occurs in the shoulders and hips but can affect muscles symmetrically throughout the body. A skin rash on the face and upper chest area is present in dermatomyositis, distinguishing it from polymyositis. Researchers are linking cancer as a possible trigger to the disease, primarily in men. What are the symptoms of polymyositis and dermatomyositis? The main symptom of polymyositis is muscle weakness. The first muscles affected are usually in the hips and thighs, although any muscle in the body can be affected. It may be difficul
