The classification and therapy of patients with chronic widespread pain without evidence of somatic factors as an explanation is currently a matter of debate. The diagnostic label "fibromyalgia syndrome"(FMS) has been rejected by some representatives of general and psychosomatic medicine.
A summary is given of the main recommendations from current evidence-based guidelines on FMS and nonspecific/functional/somatoform bodily complaints.
The criteria of FMS and of persistent somatoform pain disorder or chronic pain disorder with somatic and psychological factors partly overlap. They include differential clinical characteristics of persons with chronic widespread pain but without sufficiently explaining somatic factors. Not all patients diagnosed with FMS meet the criteria of a persistent somatoform pain disorder. FMS is a functional disorder, in which in most patients psychosocial factors play an important role in both the etiology and course of illness. FMS can be diagnosed by looking at the history of a typical symptom cluster and excluding somatic differential diagnoses (without a tender point examination) using the modified 2010 diagnostic criteria of the American College of Rheumatology. Various levels of severity of FMS can be distinguished from a psychosomatic point of view, ranging from slight (single functional syndrome) to severe (meeting the criteria of multiple functional syndromes) forms of chronic pain disorder with somatic and psychological factors, of persistent somatoform pain disorder or of a somatization disorder. The diagnosis of FMS as a functional syndrome/stress-associated disorder should be explicitly communicated to the patient. A therapy within collaborative care adapted to the severity should be provided. For long-term management, nonpharmacological therapies such as aerobic exercise are recommended. In more severe cases, psychotherapy of comorbid mental disorders should be conducted.
The coordinated recommendations of both guidelines can synthesize general medical, somatic, and psychosocial perspectives, and can promote graduated care of patients diagnosed with FMS.