Gastric cancer does not require radiotherapy, but chemotherapy, which is chemotherapy, may be required. If patients with gastric cancer can undergo surgical treatment at an early stage, they may be able to achieve a curative effect. In early stage of gastric cancer, some patients can also be completely cured by endoscopic high-frequency electrosurgery. If early gastric cancer is not accompanied by any metastases, chemotherapy is not needed after surgery, while if patients have metastases, such as lymph node metastases or progressive gastric cancer, adjuvant chemotherapy is needed. The side effects of chemotherapy are relatively large, but the purpose of chemotherapy can confine the cancer foci, destroy the remaining cancer foci, and prevent the recurrence and metastasis of gastric cancer, and patients can consult the specialist for specific treatment methods.