The survival time after chemotherapy for gastric cancer is related to the specific stage, treatment plan and effect of gastric cancer, which cannot be generalized. If a patient with gastric cancer has undergone radical surgery and postoperative adjuvant chemotherapy is completed to completely kill tumor cells, the prognosis is usually better and clinical cure can be achieved, regular follow-up is sufficient, and the patient can generally survive for a long time. If surgical treatment is not done, the patient can simply undergo a cycle of chemotherapy with maintenance chemotherapy at a later stage; or if economic conditions allow, targeted drug therapy can be given at the same time to reduce recurrence and metastasis. For patients with advanced gastric cancer that cannot be removed surgically, the average survival period is about 11 months, and palliative chemotherapy can extend the survival period by more than 2 months. In addition, gastric cancer patients may have digestive reactions after chemotherapy, such as nausea, vomiting and loss of appetite, which are all normal chemotherapy reactions. Therefore, patients are advised to have a light, easily digestible and high-quality protein diet as much as possible during chemotherapy.