Severe pain requires the use of opioid analgesics, including pethidine, morphine, fentanyl, orally, there are mesocontin, oxycontin, the patient can not eat such as advanced tumors, you can apply fentanyl transdermal patch in the navel or the surface of the abdominal wall for the treatment; generally a patch can be used for three days, but remember to remove after the use of not be able to be thrown away because the residual medicine above may also contain a lot of fentanyl! The ingredients of the medicine may still contain a lot of fentanyl. Patients with pain from abdominal wounds or drains after surgery should initially use drugs with a weaker analgesic effect, such as celecoxib or erliximab, etc., while tramadol can also be injected into the muscle for analgesia.