Certain patients with bronchial asthma can benefit, often greatly, from hypnotherapy. This report is based on a retrospective analysis of 121 asthmatic patients who were treated by hypnotherapy. Hypnotic techniques and treatment procedure are described. Of the total number, 21% had an excellent response to treatment, becoming completely free from asthma and requiring no drug therapy. A further 33% had a good response, with worthwhile decrease in frequency and severity of the attacks of asthma, or a decrease in drug requirements. About half of the 46% who had a poor response had a marked subjective improvement in general well-being. Statistical evaluation of the six variables (age, sex, result, trance depth, psychological factors and severity of the asthma) confirmed the clinical impression that the ability to go into a deep trance (closely associated with the youthfulness of the subject) gives the best possibility of improvement, especially if there are significant aetiological psychological factors present and the asthma is not severe. Subjective improvement in well-being and outlood is a potential outcome at all age levels, independent of severity of the illness or entranceability of the patient.