The NRS pain score, the numerical pain score, assesses the patient’s pain level using the Numerical Rating Scale for Pain Levels. Self-rating according to degree on a 10-point scale is divided into 1-10 levels, and pain can be classified into different degrees according to corresponding numbers, i.e., 0 for no pain, 1-3 for mild pain, 4-6 for moderate pain, and 7-10 for severe pain. According to the patient’s pain level, the corresponding pain medication needs to be selected, mainly based on the three-step pain relief principle. Patients with mild pain can choose non-steroidal anti-inflammatory painkillers, such as aspirin. Patients with moderate pain can choose weak opioid analgesics, such as pethidine hydrochloride and tramadol. Patients with severe pain can choose strong opioid analgesics, such as morphine, fentanyl, oxycodone, etc. In addition to the NAS pain score, it can be classified into 5 levels according to the VRS score, i.e., oral rating scale, i.e., no pain, mild pain, moderate pain, severe pain, and severe pain. It can also be based on VAS score, i.e. visual analog scoring method, where the corresponding location marker is selected according to the patient’s pain level and the physician performs pain analysis according to the patient’s marker.