Patients will need to be admitted to the hospital one day before the scheduled surgery date. Participating patients that are allergic to local anesthetic ropivacaine will be excluded from this study. However, if patients have allergy due to the medication after surgery, anti-allergic medication will be administered to the patients upon investigation. After the surgery, the medical doctors or nurses in the ward that is not otherwise involved in this research will assess and record the pain score using visual analog scale (VAS) (0-10). A score of 0 means no pain, whereas a score of 10 equals the worst pain ever experienced. Post-operative pain will be rated on a VAS at rest and cough. The time of arrival in the postoperative recovery room will be defined as zero hours postoperatively. The patients will be asked about the location of pain, whether at the shoulder, incision sites, and/or inside the abdomen by the medical doctors or nurses. The abdomen and shoulder tip pain intensity will be rated at two, four, six, eight, 24 and 48 hours postoperatively. The analgesic requirement during the 48 hours after the surgery will also be noted by the medical doctor or nurses in the ward. The duration of patients' participation in the study will only be for two days postoperative. However, patients still need to come for follow-up after surgery. The standard follow-up includes a visit to the outpatient clinic at 1, 2, 3, 4 weeks after surgery, then 3, 6, 9, 12, 18, 24 months and after that, a life-long annual visit. Adverse events (eg. post-operative bleeding and stapler leak) will be monitored closely at 1, 2, 3, and 4 weeks after surgery. In any occurrence of an adverse event, it will be documented and reported within 14 days.