Fibromyalgia is a disease that affects the connective tissue and locomotor system with pain and fatigue disorder in muscles, ligaments and tendons (the connective tissues of the body which consist of fibers). “Fibro” describes the fibrous aspect, “my” the muscular aspect, and “algia” the condition of pain. The term can be abbreviated to fibromyalgia. For the most part, laboratory testing in patients with fibromyalgia reveals nothing. It is particularly not possible to prove any changes as this can be done with classical rheumatism. This true and important fact leads to simplified diagnoses of “false rheumatism” in contrast to real rheumatism.