Patients with advanced gastric cancer can hardly eat and need to be introduced through gastric tube or small intestine nutrition tube, and can only eat some liquid diet or semi-liquid diet, such as milk, rice porridge, broth, etc. Moreover, because the digestive function of stomach is very weak, acid reflux, nausea, abdominal pain, bloating, diarrhea, etc. can easily occur. However, in order to maintain life, enteral nutrition is given along with some nutritious fluids intravenously to supplement nutrition. If the nutrition and calories given in these ways are sufficient, the patient can be maintained for some time, and if more serious pain occurs, pain relief treatment is needed.