The common reason for stomach cancer to become bigger in late stage is i.e. ascites, which can be treated by treating primary and metastatic tumors, abdominal puncture, diuretics and other methods. 1. In the late stage of stomach cancer, distant metastasis often occurs, such as abdominal implantation metastasis. At this time, it can lead to malignant ascites, abdominal distension, enlarged stomach and other clinical manifestations of gastric cancer patients. Radiotherapy and targeted therapy can be used to treat primary and metastatic tumors. 2. Abdominal distension and abdominal pain can also be relieved by extracting ascites through peritoneal puncture. 3. In addition, diuretics, such as hydrochlorothiazide, furosemide, spironolactone, etc., can also be applied to the patients, and it should be noted that the drugs should be applied under the guidance of doctors.