Isolated cases of the sequelae of hypnosis have appeared in the literature, but always in connection with therapy or psychopathology of some consequence. The authors made a systematic study of a nonpatient, student population. Sequelae were found in 7.7 per cent, but sequelae lasting more than a few minutes were found in only 2.3 per cent. It is postulated that the conflicts within the induction phase that produce symptoms pertain to conflicts between conscious willingness to be hypnotized and unconscious resistance to or fear of the required submission. Conflicts which occur in the established hypnotic state make the subject vulnerable to conflicts based on reality distortions or ethical social issues (i.e., superego conflicts).