One hundred adults with a chief complaint of chronic fatigue were evaluated in an outpatient setting to determine a possible association with somatization disorder. Somatization disorder was diagnosed in 15 patients. Eight functional somatic symptoms were reported more frequently by these patients: pain in extremities, joint paint, chest pain, other pain, shortness of breath, blurred vision, muscle weakness, and sexual indifference (p less than 0.001). Current mood disorders, anxiety disorders, and psychoactive substance use disorders were less common in patients with somatization disorders than in patients without this diagnosis (p less than 0.01).