Postoperative painkillers are non-steroidal, central analgesics, narcotic painkillers and so on. 1. Non-steroidal analgesics: clinically, the application of non-steroidal painkillers after surgery is more widely used, commonly used are ibuprofen, diclofenac sodium, aspirin, etc. Such drugs can inhibit the synthesis of prostaglandins, which can play a good role in relieving general pain. The adverse effects of these drugs include liver damage, kidney damage, and gastrointestinal reactions. Patients with a history of gastrointestinal diseases, patients with hepatic or renal insufficiency, pregnant and lactating women should be cautious. 2. Central analgesics: Tramadol and codeine are commonly used. They are suitable for fracture pain, postoperative pain, cancer pain and other acute and chronic moderate pain, with better pain relief effect. Adverse reactions of such drugs include nausea, vomiting, drowsiness, loss of appetite, etc. If discomfort occurs, the drug should be stopped immediately and go to the hospital. For psychotropic drugs or sleeping pills, alcohol, analgesics and other acute poisoning of patients should be prohibited. 3. Narcotic analgesics: Narcotic analgesics are represented by morphine, which has a strong analgesic effect. It is suitable for cancer pain, postoperative pain and other severe pain. This drug has strong drug dependence and is not recommended for long-term use. Adverse reactions include nausea, vomiting and constipation. It should be used with caution in patients with biliary tract disorders or respiratory failure. All of the above drugs should be applied under the guidance of a doctor, and should not be used blindly on their own. After surgery, patients are advised to take a light diet, eat more vitamin-rich fruits and vegetables, and avoid spicy and stimulating food.