Abstract
Hyperthermic aerosol therapy is a steam inhalation therapy using aerosol particles of distilled water at 43°C. In the 1980's and 1990's, Japanese otolaryngologists began to use in this therapy as a sort of physiological therapy for rhinosinusitis. Since then much clinical evidence has been collected to show the beneficial effects of this therapy in rhinosinusitis, especially in cases of allergic rhinitis. Recently, it has been suggested that the immunological defense ability is supported and promoted by this therapy via stabilization of the autonomic nervous system. Hyperthermia aerosol therapy is expected to join the ranks of hot-spring and sauna therapy or aroma therapy in the field of health promotion and disease prevention.