Stomach cancer is one of the common malignant tumors in China, and its incidence rate is the first among all kinds of tumors in China. The incidence rate of gastric cancer in China is the highest in northwest China, with about 170,000 people dying of gastric cancer every year, almost 1/4 of all malignant tumor deaths, and more than 20,000 new gastric cancer patients are produced every year. The causes of gastric cancer are unknown and may be related to various factors, such as lifestyle habits, diet, environmental factors, genetic quality, mental factors, etc. It is also related to chronic gastritis, gastric polyps, gastric mucosal anomalous hyperplasia and intestinal epithelial hyperplasia, post-surgical residual stomach, and long-term Helicobacter pylori (HP) infection, etc. . Gastric cancer can occur in any part of the stomach, but it is mostly found in the sinus region, especially on the side of the gastric lesser curvature. According to the depth of cancer tissue infiltration, it is divided into early gastric cancer and progressive gastric cancer (middle and late gastric cancer). Early symptoms of gastric cancer are often not obvious, such as elusive upper abdominal discomfort, vague pain, belching, acidity, loss of appetite, mild anemia and other symptoms similar to gastroduodenal ulcer or chronic gastritis. In some patients, the pain is reduced or relieved after taking painkillers, anti-ulcer drugs or diet modification, and thus is often ignored without further examination. As the disease progresses, the symptoms of stomach gradually become obvious, such as epigastric pain, loss of appetite, emaciation, weight loss and anemia. In the later stage, there are often metastases, abdominal masses, enlarged left supraclavicular lymph nodes, black stools, ascites and severe malnutrition. Elderly people without stomach diseases should be more alert to the possibility of stomach cancer once black stool appears. If the stool is tarry and the fecal occult blood test is consistently positive, it is one of the important symptoms of early gastric cancer. Therefore, those who have such symptoms should go to hospitals with such conditions for gastroscopy and upper gastrointestinal barium meal X-ray to make a clear diagnosis. Unexplained emaciation, weakness and mental discomfort are also a group of common but unspecific signs of gastric cancer, and they are progressively getting worse. Surgical resection is the main treatment for gastric cancer and the only effective treatment for gastric cancer. Therefore, the treatment of gastric cancer should take a positive attitude, especially for early and mid-stage gastric cancer, as long as the patient’s general condition allows, surgery should be performed as soon as possible, supplemented by necessary radiotherapy and chemotherapy to keep the hope of cure.