After a patient has undergone surgery, the painful symptoms of the wound usually improve significantly after 3-5 days. Especially if the patient has undergone surgical treatment of the abdomen, the peak period of tissue edema with pain symptoms is within 72 hours after surgery. With the passage of time, the local tissue edema and inflammatory reaction gradually reduce, so the patient’s local pain symptoms will gradually improve in 3-5 days after surgery. However, if the patient has wound infection or fat liquefaction after the surgery, the pain symptoms will last longer when the wound dressing is changed, and some patients will last about 7-10 days. At this time, the patient needs to be injected with anti-inflammatory drugs through the vein in a timely manner, as well as to strengthen the drainage of the wound and change the treatment, in order to control the local inflammation and fat liquefaction faster, so as to reduce the local pain symptoms.