Pain is an unpleasant reaction of the organism to damaged tissue or potential damage, a complex physiological and psychological activity, and one of the most common clinical symptoms. It consists of two parts: nociception and pain response. It consists of the pain sensation caused by the action of an injurious stimulus on the organism, and the pain response of the organism to the injurious stimulus. Pain intensity assessment Pain assessment is the most critical step in pain control, and as pharmacists and sales clerks who come into contact with patients in pain, we need to first understand the grading of pain. There are four main methods of determining pain intensity, all of which require a subjective assessment by the patient. Common sense Pain intensity assessment should not only be assessed when quiet, but also when the patient is exercising, because exercise without pain, in order to achieve the purpose of physical exercise and early recovery of function. 1, the patient complains of simple grading method (VRS), also known as the pain level oral grading method, referred to as the 4-level method. The method is simple and easy to understand, but appears to be generalized and simple, the degree of personal tolerance varies, subjective, sometimes it is not easy to use, need to explain to the patient from multiple perspectives and instructions. Grade 0 No pain Grade Ⅰ (mild) Painful but tolerable, normal life, undisturbed sleep Grade Ⅱ (moderate) Painful and obvious, intolerable, requiring painkillers, disturbed sleep. Grade Ⅲ (severe) Pain is severe and intolerable, sleep is seriously disturbed, may be accompanied by autonomic disorder or passive body position. 2.Numeric Rating System (NRS) This is a numeric visual expression of VAS, patients are asked to express the intensity of pain with the number “0 to 10”, 0 for no pain, 10 for the most intense pain, that is, once felt, or imagined the most intense pain, there is no more intense pain than this. The advantage is more intuitive, patients are easy to understand and express, has become the most widely used and simple and effective method of pain evaluation. The shortcomings of this method are that patients are susceptible to digital interference, the lack of quantitative basis, individual understanding of the greater arbitrariness, and the need for patients to have a certain ability to think abstractly. 3, Wong-Baker Faces Pain Rating Scale (Wong-Baker Faces Pain Rating Scale) This method uses six facial expressions from smile to sadness to crying to express the degree of pain, respectively, assessed as: no pain, a little bit of pain, a little bit of pain, more pain, a lot of pain, the most pain. The method is applicable to any age, has no specific cultural background or gender requirements, is easy to master, does not require any additional equipment, and is particularly suitable for acute pain, the elderly, children (3 to 6 years old), and those who are unconscious or unable to express themselves verbally.