Patients with advanced cancer will show obvious pain, which is also called cancer pain. In this case, the aim of treatment is mainly to relieve the patient’s pain. Although many pain-relieving drugs have certain side effects, they can be treated symptomatically in order to relieve the patient’s pain. The commonly used method is to apply oral pain medication, which can be gradually transitioned to non-opioid medication at the beginning, weak opioid medication gradually, and finally strong opioid pain medication. If the oral medication fails to relieve the pain, the dose of the medication can be increased appropriately, or two pain medications can be applied under the guidance of the doctor. However, during the application of these drugs, because it will irritate the mucous membrane of the gastrointestinal tract, it is best to let the patient eat a small amount of fluids, or apply drugs to protect the mucous membrane of the gastrointestinal tract. In addition, you can also use painkillers, or apply epidural pain relief and intravenous pain relief.