In this clinical trial we are aiming at finding the best way of controlling pain after cesarean section. This is a triple blind study on 120 pregnant women referred to Afzalipour hospital for cesarean section. Exclusion criteria include: patient’s cancellation of entering into this study, bleeding, time consuming surgery, unexpected events, severe pain which needs additional analgesics. Inclusion criteria are: age 20-45 year, weight 60-80kg, primi gravid, no sensitivity or special illness. Visual analogue scale will be taught to all patients who are subjected to the study and then general anesthesia with Thiopental and Succinyl will be given to them. During anesthesia Atracurium and Fentanyl will be administered and finally the anesthesia will be kept on Isoflurane and N2O. The patients will be divided into groups postoperatively. Interventions include administration of suppositories of Indometacine 100mg in group І, Naproxen 500mg in group ІІ, Acetaminophen 325mg in group ІІІ, and Diclofenac 100mg in group ІV, administering rectally when the patient has pain. At the time of arriving a trained nurse who is blind to administered medicine watches and evaluates vital signs and pain, by means of Visual Analogue Scale. After administration of suppository, 15 minutes and one hour after administration, vital signs and pain will be evaluated again. Then information will be recorded in forms and data of any of four groups import in SPSS as codes and analysis will be done. Analyzer will be blind to groups. The blindness will be opened by the manager and data will be interpreted.