For laparoscopic surgeries and surgeries with small wounds, the wound usually hurts for 1-2 days after surgery. If the wound is painful, you can take oral painkillers, such as celecoxib or ibuprofen, or intramuscular injections of painkillers such as tramadol to treat the symptoms. In case of major surgeries with particularly long wounds, such as pancreaticoduodenectomy, hepatic resection or gastric cancer, because the wounds are larger and longer, and there are more stitches, the pain in the wounds after the surgery may take longer, and the pain may be present for 3-4 days. The wound may also be more painful if an infection occurs within the wound after surgery, or if there is subcutaneous liquefaction. If infection occurs, the surface stitches need to be removed, filled with gauze usually drainage, every day need to change the medicine, this time the wound is more painful, usually wait until the wound healing time, the pain will improve.