Whether stomach cancer needs surgery or not is mainly decided roughly according to the analysis of the tumor. Generally speaking, after diagnosing stomach cancer, patients need to do relevant examinations, such as chest, abdomen and pelvis enhanced CT or upper abdomen MRI, to make preliminary judgment on the stage of stomach cancer. If the tumor is considered to be in stage I or II, surgery is definitely needed, and the tumor is in stage III, which indicates that the tumor is relatively large and may have metastasis in the surrounding lymph nodes, and the viewpoints of whether to do the surgery are different in different places. In some areas, surgery can be done directly, and in some areas, neoadjuvant therapy should be done first, and the size of the tumor should be evaluated again after 2-3 courses of treatment before deciding whether surgery is needed. If the tumor is advanced stage IV gastric cancer, surgery is generally not recommended, because surgery is more traumatic and may not prolong the overall survival of patients.