Drugs for the treatment of pain are mainly divided into three categories: first, aspirin, ibuprofen, anti-inflammatory pain, paracetamol, celecoxib and other non-steroidal anti-inflammatory drugs, the pain-relieving effect is relatively weak, mainly used for colds, muscle aches and pains, colds, fatigue headaches, neuralgia, etc.. Second, Tramadol and other central painkillers, Tramadol’s analgesic effect is stronger than the general antipyretic painkillers, mainly used for a moderate degree of various acute pain and postoperative analgesia. Third, morphine, dulcolax and other opioids, for narcotic painkillers, mainly used for patients with advanced cancer, the role of stronger, long-term application of addictive.