At least as far back as the American Civil War, soldiers have reported nonspecific ailments that could not be attributed to an underlying medical cause. The most frequent symptoms include persistent fatigue, palpitations, headache, muscle or joint pain, disturbed sleep, and cognitive difficulties. Recent epidemiologic studies suggest that war-related syndromes are exceptionally common in deployed personnel and may affect 45% to 60% of returning soldiers. These post-deployment symptoms have substantial consequences that include increased medical visitation, increased physical disability, and increased psychological distress. The number of veterans at risk is likely to increase rather than decrease in the years ahead. In order to address this anticipated increase, new and more efficient treatments for symptom-based illness are urgently needed to augment or replace standard VA care. An effective treatment using cognitive-behavioral techniques (CBT) has been developed to ameliorate symptom-related distress and reduce unnecessary healthcare utilization. Despite convincing evidence of therapeutic efficacy, a major limitation of this treatment is that patients must attend sessions in person. This requirement may undermine the effectiveness of CBT since fewer than half of those who need treatment will attend. A recent trial of CBT for veterans with Gulf War Illness found that only 38% were treatment adherent. Any sudden increase in the number of veterans seeking care could overwhelm the limited resources of a local VA healthcare center. The proposed study will address this important public health problem by testing a cost-effective and innovative strategy for delivering CBT over the phone.