Actions of spa therapy on endocrine-autonomic nerve system and psychological factors were analyzed in patients with bronchial asthma. In endocrine function, serum levels of cortisol and ACTH tended to increase after spa therapy. In autonomic nerve system, decrease in concentrations of serum adrenalin and noradrenalin was observed after spa therapy, and the difference between the initial levels before spa therapy and the levels after the therapy was significant in serum levels of adrenalin. However, serum levels of substance P and Bradykinin were not affected by spa therapy. To evaluate the action of spa therapy on mental condition in patients with asthma, four kinds of psychological tests, CMI, SDS, CAl and SD, were carried out. Improvement of mental disorders in patients with asthma is observed after spa therapy in all psychological tests. These results suggest that spa therapy acts effectively on endocrine-autonomic nerve system and improve psychological conditions.