Gastric cancer remains one of the most common malignant tumors in China. If it can be detected early and diagnosed early, the treatment effect is very satisfactory. Does gastric cancer have early symptoms? The answer is negative. Nearly half of the patients with early gastric cancer have no clinical symptoms at all. Only a small number of patients have symptoms such as mild indigestion, and these symptoms are not unique to gastric cancer, but can be seen in chronic gastritis, ulcer disease and functional dyspepsia, which may also occur occasionally in normal people. Therefore, it is useless to talk about early manifestations of gastric cancer. Then, how to diagnose stomach cancer at an early stage? The key is to be aware of health care and to have regular (1 year is good) gastroscopy for healthy people over 40 years old, so that gastric cancer can be detected, diagnosed and treated in its early stage. In addition, for gastric cancer, upper gastrointestinal bleeding, often manifested as black stool, can occur in both early and intermediate stages (progressive stage). A small number of early gastric cancer can be manifested as mild upper gastrointestinal bleeding symptoms, i.e. black stool or persistent positive occult blood in stool. It is mostly seen in polyp-like and ulcer-like early gastric cancer, which is caused by long-term small bleeding due to surface erosion of the lesion or invasion of capillaries by the cancer, and also in various subtypes of early gastric cancer with flat lesions. It is characterized by the fact that it is not easy to be controlled by drug therapy. Elderly people with no gastric disease should be more alert to the possibility of gastric cancer once black stool appears. If the stool is tarry and the fecal occult blood test continues to be positive, especially when it is not easily stopped even after general diet control or gastric drugs, it is one of the important symptoms of early gastric cancer. Therefore, those who have this symptom should go to a hospital in time for gastroscopy and barium X-ray of upper gastrointestinal tract to make a clear diagnosis.