In general, any pain that has been troubling people’s health for a long time can be seen in the pain department. The main scope of practice of the pain department is the diagnosis and treatment of chronic pain. The term chronic pain generally refers to pain that has been present for more than 1 month. This kind of pain often recurs within a certain period of time (several months to years), is sometimes mild and sometimes severe, and persists, seriously affecting the quality of life of patients, such as trigeminal neuralgia, postherpetic neuralgia, sciatica, migraine, frozen shoulder, cervical spondylosis, lumbar disc herniation, osteoarthritis of the knee, osteoporosis, residual limb pain, phantom limb pain, chronic postoperative pain, etc. Acute pain, such as pain from acute injury to soft tissue and joints, post-surgical pain, acute herpes zoster pain, etc. Cancer pain, pain that persists while or after completion of anti-cancer treatment. Pain with less clear cause, or pain with clear cause but no obvious effect from other medical treatment.