Wound pain is one of the most worrying problems for many patients. Wound pain is an important manifestation of the human body’s stress response and is a normal physiological and psychological activity. The degree of pain is related to the size of the wound, the site of surgery, etc. It is also closely related to a person’s anxiety. The more severe the anxiety, the lower the pain threshold of the organism, and the increased sensitivity to pain in patients with high psychological fear. There are usually two ways to reduce trauma pain after surgery. One method is to leave postoperative analgesic pump injection in the intravenous or epidural cavity. This method can reduce pain continuously and smoothly, but some patients have more obvious discomfort such as dizziness and nausea; the other method is to inject intramuscular analgesic when the pain is severe, which has good pain relief effect but short duration, usually lasting 2-4 hours. The pain is most intense within 3 days after thoracic surgery, and then gradually relieves. There are also individual patients with mild pain. Commonly used painkillers after surgery have different degrees of side effects of inhibiting gastrointestinal movement, which will affect the recovery of patients from bed activities, but short-term use will not produce dependence.