Is a rare condition found in more women then men and is usually onset at 40 –60 years of age. Symptoms include burning, swelling, skin discoloration, aching pain, abnormal sweating, altered temperature or hypersensitivity of the arm or leg. Gentle guided exercising of the arm or leg may improve range of motion and strength and relaxation techniques can help to reduce pain. The earlier the disease is diagnosed, the more effective exercises may be.