The purpose of this study is to reduce pain after surgery for obesity.The patients with BMI> 40 or BMI> 35 with one comorbidity who are undergoing laparoscopic bypass surgery, are enrolled. Patients who convert to open or have activated drain, for any reason, so we must maintain the drain over 24 hours, are excluded from this study. We start this study in patients with morbid obesity who admitted in Rasool-e-Akram hospital. We select 50 patients. The intervention is that, At the end of the operation, when we have the negative result for air leak, in one group of patients Penrose drain was extracted from 5mm port in the left ant axillary line and in another groups through right midclavicular port. The Days after surgery leak test with methylene blue will performed.in Patients who haven’t leak, the drain will be removed completely in the same day and will discharge and Patients with positive tests excluded from the study. The questionnaire for patients, including pain localization, severity of pain, positional association, relation to drain extraction site and other ports, the quality of pain and, etc. in 24 hours, 1 week and 1 month after the operation was filled.