The treatment of chronic pain has always been a difficult problem in the medical community. A growing number of clinical cases have shown that ketamine injection therapy has a good effect on the treatment of multiple chronic pain. As the first member of the American Anesthesia Association, Dr. Iris Ko, the M.D. of the Dling Medical Aesthetic Center, is the first Doctor who introduced ketamine therapy to the Chinese community in California. By far, for more than 70% of patients, almost all symptoms associated with chronic pain has disappeared after first set of treatment.