[Psychosomatic disorder and functional somatic syndrome].
Functional somatic syndrome (FSS) has received a great deal of attention in recent years, and most have been treated as psychosomatic disorders. A psychosomatic disorder is a physical disorder that is closely related to psychosocial factors that affect the onset or clinical course of the disease. For most patients with FSS, the mind-body relationship is related to psychosocial stress. It is important to consider the psychosocial background of the patient as it relates to their pathology. Our psychosocial model that includes four psychosocial factors and our five-step treatment program for patients with functional somatic syndromes are presented.