The mortality rate of advanced gastric cancer is extremely high. Usually, the symptoms of advanced gastric cancer patients three days before death are as follows: First, extreme emaciation. Due to the spread of cancer cells in advanced gastric cancer, patients will have low appetite, so they will suffer from malnutrition and anemia after a period of time, thus their bodies will appear skin and bones. Secondly, difficulty in swallowing. Cancer cells in advanced gastric cancer will metastasize to the esophagus, thus causing patients to have difficulty in swallowing and unable to eat. Third, difficulty in breathing. Advanced gastric cancer will lead to liver, lung and even cachexia, which will greatly affect breathing. Fourthly, body pain, many patients with advanced gastric cancer will have swollen lymph nodes, enlarged abdomen, jaundice, abdominal masses and other symptoms, which will cause severe pain at this time. Therefore, it is necessary to take first aid measures and guide the patient’s mentality, and the treatment mainly focuses on prolonging the patient’s life and improving the patient’s survival quality.