Stomach cancer etiology: 1.Environmental factors – volcanic rock high mud and carbon soil, excessive nitrate, trace elements imbalance, chemical pollution (Pacific Rim coast). 2, dietary factors – less fresh fruits and vegetables, more salty food, now the improvement of stored food, some improvement. 3.Personal factors – A blood type, smoking, H. pylori infection. The early stage of gastric cancer is mostly non-specific symptoms, and the age of 45-55 years old is the most, but there are also many young and old patients, for example, there is an old man, who went to the United States to visit his family, also vomited for a while, thought it was food poisoning, went to the hospital to vomit blood, and emergency gastroscopy confirmed that it was gastric cancer. And when gastric cancer reaches advanced stage, many patients lose weight, pain, abdominal distension, jaundice, diarrhea, peritoneal effusion, left supraclavicular lymph enlargement, severe anemia, pelvic metastasis, liver metastasis, bone metastasis. It is recommended that people over 40 to 50 years old with a history of upper abdominal discomfort should undergo gastroscopy every two years, and if such patients come for consultation → it is recommended to see a specialist to rule out gastric cancer.