There is no internationally standardized pain quantification table, and the twelve levels of pain classification are not commonly used in clinical practice and are not part of the medical way of pain classification. At present, it is recognized and more often used by the World Health Organization to divide the pain level into the following five degrees: 1.0 degree: no obvious pain; 2.I degree: mild pain, mostly intermittent, tolerable, usually does not affect daily life and rest, may not apply drugs for treatment; 3.II degree: moderate pain, persistent pain, will affect life and rest, need to apply pain medication to help relieve The pain is persistent and unbearable, and it is impossible to live a normal life and rest, and must be relieved by medication; 5. In addition, sometimes the pain level can also be carried out by means of numerical scoring, in which O is no pain, 10 is the most painful, 1 to 3 is mild pain, 4 to 6 is moderate pain, and 7 to 10 is severe pain. Pain is a common clinical symptom with complex causes. Trauma, inflammation, central and peripheral nervous system lesions, tumor growth and compression, and psychosomatic factors may cause pain, so the pain level is scored and mostly used in disease diagnosis and treatment as well as clinical research. Patients with unexplained pain symptoms should seek medical consultation promptly to clarify the diagnosis and deal with the cause.