There are very many reasons for death caused by gastric cancer: First, the cancer cells spread widely, resulting in the loss of resistance in the body and functional failure of various organs leading to death. Secondly, poor immunity and increased intestinal permeability cause bacteria in the intestine to enter the blood, causing sepsis, leading to death. Third, it generates pleural fluid to compress the lungs, leading to infection or atelectasis of the lungs, causing respiratory failure leading to death. Stomach cancer will spread to the whole body through blood metastasis and lymphatic tract metastasis, eroding normal cellular resources, causing the failure of important organs in the whole body, and finally causing death. V. Patients with advanced gastric cancer have difficulty in eating and poor nutritional status, which eventually leads to consumptive death. Sixth, patients with gastric cancer are prone to bleeding because of the inhibition of bone marrow hematopoietic function and reduction of platelets, and cancer cells themselves will directly destroy blood vessels, and serious pollution will destroy blood vessels, resulting in more rupture and bleeding, which will cause death. Seven, metastatic tumor will also cause metabolic disorder, and even cause kidney failure causing death.