Pain in advanced gastric cancer is the main symptom, and cancer pain treatment is very important and humane treatment, which is handled according to WHO’s cancer pain ladder therapy, as follows: 1) taking weak analgesic drugs, such as acetaminophen, and non-steroidal anti-inflammatory drugs, commonly used as fen-phen and celebrex; 2) adding weak opioid drugs, such as tramadol; 3) using strong opioid drugs, such as morphine and dulcolax, and in hospitals, also using drugs of equal effect, such as oxycodone and hydromorphone. Equivalent drugs are also used in hospitals, such as oxycodone and hydromorphone; 4. Interventional treatment, which also has different methods, such as performing abdominal plexus nerve blocks, which block painful stimuli through painful afferents. There are also intrathecal pumps, where a tube is placed in the subarachnoid space and connected to a drug pump, and the drug is continuously infused into the subarachnoid space to provide analgesia. Depending on the patient, the intervention may be advanced in order to reduce the adverse effects caused by drug use.