The NRS Pain Index score uses 0-10 to represent different levels of pain. Patients should be asked how much pain they have, marked, or asked to draw a number that best represents their own pain level. This method is more commonly used in clinical practice. 0 no pain 1-3 mild pain (pain does not affect sleep) 4-6 moderate pain 7-9 severe pain (cannot sleep or wake up in pain during sleep) Yang Mingjun, Department of Joint Orthopedics, Tongliang County Hospital of Traditional Chinese Medicine, Chongqing, China 10 severe pain Medical classification of pain 1, the World Health Organization (WT0) classifies the degree of pain as O degree: no pain; Ⅰ degree: mild pain, intermittent pain, without medication; II degree: moderate pain, continuous pain It affects rest and requires painkillers; III degree: severe pain, which is continuous pain and cannot be relieved without medication; IV degree: severe pain, which is continuous severe pain with changes in blood pressure and pulse rate. 2.Numerical grading method (NRS) The numerical grading method uses 0-10 to represent different degrees of pain, with 0 being no pain and 10 being severe pain. The grading standard of pain degree is: 0: no pain; 1-3: mild pain; 4-6: moderate pain; 7-10: severe pain. 3. grading method according to the degree of pain complained of (VRS method) Grade 0: no pain. grade I (mild): pain but tolerable, life is normal, sleep is not disturbed. Grade II (moderate): pain is obvious and unbearable, requiring analgesic drugs, sleep is disturbed. Grade III (severe): pain is severe and unbearable, analgesic drugs are required, sleep is severely disturbed may be accompanied by autonomic disorder or passive body position.