Somatization disorder is a syndrome characterized by the presence of multiple medically unexplained physical symptoms. It often results in substantial functional impairment and the need for extensive medical treatment. Neither pharmacological nor psychosocial treatments for the disease have demonstrated clinical success. People with somatization disorder may benefit from a treatment that integrates emotion-centered strategies into cognitive behavioral therapy. The long-term effectiveness of this treatment has not been established, however. This study will examine the long-term effect of cognitive-affective behavior therapy on the physical symptoms, functioning, and health care utilization of people with somatization disorder.