An elderly male with stomach cancer went to hospital for radical gastric cancer surgery. After surgery, he thought chemotherapy hurt his body and did not want to do chemotherapy, and he felt good about himself after surgery and also thought there was no need to do other treatments. After returning home, after half a year, he felt abdominal distension and vague abdominal pain and went to the hospital for examination and found ascites, which was diagnosed by the doctor as recurrence of gastric cancer, which was already in advanced stage. At present, the treatment of gastric cancer is the mode of surgery plus chemotherapy. The effect of surgery alone is mostly unsatisfactory. Combining chemotherapy can improve the treatment effect. Therefore, after surgery, if the doctor thinks chemotherapy is needed, it is more reasonable to insist on finishing this treatment. Although chemotherapy has some side effects, most people can persist with it and do not need to be afraid.