Many recent studies registered respiratory dysfunction after laparoscopic surgery; it is well known that the stimulation of the diaphragmatic tendon centre produces a typical shoulder pain. We hypothesize that diaphragmatic tendon centre stress causes postlaparoscopic ventilatory alterations; the aim of this study was to verify whether clinically respiratory dysfunction and shoulder pain relationship exists, after laparascopy with or without contemporaneous stimulation of gallbladder area. So we evaluated, preoperatively and 24 hours after the operation, 20 patients undergoing laparoscopic cholecystectomy (CP), 20 gynaecological patients undergoing laparoscopic ovarian surgery (GP) and 20 control patients undergoing orthopaedic limbs operations (OP) by pulmonary function tests, using computerized spirometry. Diaphragm referred pain was assessed for location and intensity. No orthopaedic patient showed postoperatively pain or pulmonary dysfunction demonstrating that the typical postlaparoscopic restrictive pattern is independent of general anaesthesia. In the CP and GP groups postoperative pulmonary functions were significantly reduced if compared with the orthopaedic control group but not significantly different between them. Moreover, 8 patients from the CP group and 13 from the GP group referred diaphragmatic pain: they showed significantly greater reduction of pulmonary function in comparison with the patients without pain in the respective groups. We conclude that diaphragmatic dysfunction after pneumoperitoneum, and not gallbladder area stimulation, seems to play the most important role in the pathogenesis of both shoulder pain and respiratory restrictive abnormalities after laparoscopy.