Everyone has experienced pain. The presence of pain can warn people away from harm. However, chronic pain that exists for a long time has been classified as a group of diseases along with diabetes and hypertension. Especially with the progress of human civilization, the accelerated pace of life and the advent of an aging society, the incidence of chronic pain has a tendency to increase year by year. Chronic pain not only increases the suffering of the majority of patients, but also increasingly becomes a social problem. Pain science, as an emerging discipline, is increasingly showing an important clinical and academic status, and increasingly attracting the attention of the majority of doctors and patients and society. The pain clinic (pain department) is a specialized clinical department for the diagnosis and treatment of complex painful diseases in hospitals. Examples of common diseases treated in the Pain Clinic are headache, trigeminal neuralgia and glossopharyngeal neuralgia, and recurrent episodes of transient lightning-like, slash-and-burn pain in the distribution area of the trigeminal and glossopharyngeal nerves. There are primary and secondary pains. Pain of spinal origin includes cervical spondylosis, occipital neuralgia, lumbar disc herniation, discogenic pain, sciatica, posterior spinal nerve syndrome, and postoperative pain of the cervical and lumbar spine. Herpes zoster and herpes zoster neuralgia Rheumatoid arthritis and rheumatoid arthritis Gout Osteoarthritis Osteoporosis Cancer pain Soft tissue inflammatory pain Post-operative scar pain and other unexplained pain