Pain grading methods are as follows: 1. verbal scoring method: if the patient is not intubated, the pain grade is divided into 0-10 points, and the patient is asked to self-describe how many points the pain can reach; 2. numerical marking method: the pain grade is divided into 0-10 points, and the patient self-evaluates the current pain as several points; 3. visual scoring method: prepare a 100mm ruler, 10mm is a grade, and ask the patient to indicate which position the pain reaches The patient should indicate the position of the pain; 4. Facial expression method: from smile to pain, there are six kinds of expressions, and the patient should identify which state he/she is currently in and evaluate it. When the patient cannot describe the pain in words, objective numerical evaluation is generally used, but the most reliable is still the patient’s subjective description, and the doctor should add or subtract medication according to the degree of pain to help the patient in the treatment.