In 2001, the World Health Organization (WHO) classified pain as the fifth vital sign after temperature, respiration, pulse, and blood pressure. Unlike temperature, respiration, pulse, and blood pressure, which can be measured objectively, pain is a subjective sensory and emotional experience that is caused by a variety of factors, and is affected by a variety of factors, including physical, mental, environmental, cognitive, and behavioral. The quantification of pain must be assessed in terms of the location, degree, nature and mental aspects of pain, etc. Therefore, we need to be able to combine the body’s internal objective signals and individual variations, more sensitive and comparable, and suitable for the quantification of pain in people of different age groups and cultural backgrounds, and the most commonly used is the VAS (Visual Analog Pain Scoring), in which the patient is assessed according to the degree of pain he/she feels, and the pain is measured in a visual analog scale. The VAS (Visual Analog Pain Scale) is a method in which the patient marks a point on a 10-cm long straight line to indicate the intensity of pain, with “no pain” and “intolerable pain” at each end, and the length of the distance from the left end of the line to the mark is the amount of pain. 0″ means no pain, “1-3” is mild pain, “4-6” is moderate pain, and “7-6″ is severe pain. ” for severe pain.