Abstract:A 19‐year‐old patient with I female appearance visited our department for treatment of bulimia nervosa. The patient had primary amenorrhea. Chromosomal studies revealed a 46XY karyotype, and the plasma testosterone level was in the range of normal adult males. The patient was diagnosed as having testicular feminization syndrome. The psychological backgrcund, such as severe anxieties concerning her body, was behind the eating disorders. Examinations revealed intraabdominal testes. A bilateral gonadectomy was performed, and no androgen receptors were detected in the suprapubic skin. After the gonadectomy, the patient's mental status became much more stable, and the ability to control her eating pattern was restored. Testicular feminization with bulimia nervosa is rare in Japan. The importance of mental support and a careful follow‐up to people with testicular feminization is being disc