Pain is a subjective human sensation, and tools for pain assessment include the numerical pain assessment method, visual analog assessment method, textual description assessment method, and facial expression measurement chart assessment method. The numerical pain assessment method is divided into 0-10 levels, consisting of 11 digits divided into 11 levels. When at level 0, it means that the pain is not obvious and there is no obvious pain sensation, and the pain grows as the number grows. The text description assessment method is to divide a straight line into 5 segments with corresponding text describing pain at each point, where one end has no pain sensation and the other end indicates unbearable pain. The visual mock trial assessment method is the most widely used method in China, and there is a 10-cm-long moving scale with 10 scales on one side, 0 and 10. 0 indicates no pain, and 10 represents the most severe pain that is unbearable.