Gastric cancer is a malignant tumor originating from the epithelium of the stomach. Like other cancers, patients with advanced gastric cancer will eventually die from complications of cancer, and the main causes of death are as follows: 1. For example, liver metastasis of stomach cancer leads to liver failure and brain metastasis of stomach cancer leads to central nervous system dysfunction. 3. Rupture and bleeding of stomach cancer leads to hemorrhagic shock and death of patients. Patients with advanced gastric cancer have poor immunity and are prone to various kinds of infections, and severe lung infections can lead to respiratory failure and death. 5. Death caused by electrolyte disorders, patients with gastric cancer can suffer from electrolyte disorders such as hypokalemia and hyponatremia, and severe hypokalemia can induce serious cardiac arrhythmias, and severe hyponatremia can lead to cerebral edema, which can easily lead to death. These are the direct deaths caused by gastric cancer. Clinically, deaths related to gastric cancer treatment are not rare, and many patients can die because of the side effects of chemotherapy or radiotherapy.