Pain in advanced stage of stomach cancer can be relieved by morphine. However, whether morphine is needed or not needs to be chosen after comprehensive assessment according to the condition and selection of appropriate drugs. Commonly used drugs include 1. Principles of analgesic treatment for cancer pain: oral medication as the mainstay; stepwise medication according to the assessment of condition; on-time medication; individualized medication plan. 2. Commonly used drugs (1) Mild pain: non-steroidal anti-inflammatory drugs including acetaminophen, celecoxib and budesonide can be used. (2) Moderate pain: codeine phosphate, tramadol hydrochloride and other weak opioids; low-dose strong opioids such as morphine, oxycodone hydrochloride, fentanyl, etc., and can be combined with the application of non-steroidal anti-inflammatory drugs, clonidine, midazolam and other anticonvulsants, or fluoxetine, paroxetine and other antidepressants. (3) Severe pain: preferred morphine, oxycodone hydrochloride, fentanyl and other strong opioids, can be combined with non-steroidal anti-inflammatory drugs, clonidine, midazolam and other anticonvulsants, or fluoxetine, paroxetine and other antidepressants. The above drugs need to be used under the guidance of clinicians, and unauthorized use of drugs is prohibited; severe pain complicated by cancer is recommended to go to the hospital in time.