Participants in this open-label study will be randomly assigned to receive either cognitive-affective behavior therapy (CABT) or standard medical care that is augmented by a psychiatric consultation. Treatment will last 4 months. Assessments of somatic symptomatology, functional impairment, and health care costs will occur at screening, baseline (1 to 2 weeks after screening), and 4, 10, and 16 months after baseline. The visits at 10 and 16 months post-baseline will assess specifically the long-term efficacy of the treatment.