SUMMARYA retrospective study of eleven cases of unexplained postoperative jaundice revealed that in four cases anaesthesia did not include halothane. In all the cases there was difficulty in obtaining full details about the patient, and in some cases all relevant information was missing. Of the seven cases who were given halothane, in only two was there no other obvious cause of the jaundice than halothane. The incidence of postoperative jaundice is in fact very low, and does occur after non-halothane anaesthetics. In most cases, the cause can never be established with any degree of certainty from case histories and the liver function tests available at present.