Effective treatments have been developed to ameliorate symptom-related distress and reduce unnecessary healthcare utilization using cognitive-behavioral techniques (CBT) . However there is a major limitation of this treatment is that patients must attend sessions in person. The specific aims of the study are to: (1) Determine the clinical efficacy of Telephone CBT for veterans with GWI who are frequent consumers of ambulatory medical care; (2) Determine whether CBT for veterans with GWI leads to a reduction in the cost of VA health care; and (3) Develop a statistical model of treatment seeking in veterans with GWI who are frequent consumers of ambulatory medical care.