Nearly half of early gastric cancer patients have no clinical symptoms, and only some of them have symptoms such as mild indigestion, such as vague discomfort in upper abdomen, slight fullness, pain, nausea, belching, etc. These symptoms are not unique to gastric cancer, but can be seen in chronic gastritis, ulcer disease, functional dyspepsia, and even normal people occasionally. According to the survey: about 80% of gastric cancer patients have upper abdominal pain; about 1/3 of gastric cancer patients have stuffy stomach, upper abdominal discomfort, loss of appetite, indigestion, accompanied by panic acid; 1/3 of gastric cancer patients may have unexplained weight loss, emaciation and fatigue although they have no obvious digestive symptoms; some gastric cancer patients show symptoms such as panic acid, heartburn, nausea, vomiting, belching or black Some gastric cancer patients show symptoms such as acidity, heartburn, nausea, vomiting, belching or black stool. For early gastric cancer, the more common symptoms are upper abdominal discomfort, such as mild stomach pain, swelling and heaviness, and sometimes vague pain in the heart fossa, which are often diagnosed as gastritis or ulcer disease and treated at first, and the symptoms may be temporarily relieved. If the lesion occurs in the gastric sinus, changes in duodenal function may occur, with rhythmic pain, similar to the symptoms of ulcer disease, which is also easily misdiagnosed as duodenal ulcer and delayed treatment. However, all these symptoms can recur after a period of time. Therefore, anyone with symptoms of epigastric discomfort, if accompanied by other high-risk factors, or with recurrent recurrences after treatment, must be vigilant and undergo further investigations with a view to early detection and early treatment. Indigestion symptoms such as loss of appetite, anorexia and poor appetite, nausea and vomiting, bloating after eating, belching and acid reflux are also a group of common but non-specific early signs of gastric cancer. Loss of appetite may be an early symptom of gastric cancer and should be taken seriously. Some patients automatically restrict their daily diet due to bloating and belching after eating, resulting in weight loss, emaciation and weakness. Early symptoms of gastric cancer may also include feeling of fullness after eating and mild nausea. Tumor of cardia may start with unpleasant eating and gradually develop into difficulty in swallowing and food reflux. Further development of sinus cancer may lead to vomiting due to pyloric obstruction. The above symptoms may be misdiagnosed as functional dyspepsia, so early medical consultation and gastroscopy should be conducted to detect gastric cancer at an early stage. Upper gastrointestinal bleeding, often in the form of black stools, can occur in both early and progressive gastric cancer. In addition, a small number of early gastric cancers may present with mild upper gastrointestinal bleeding symptoms, i.e. black stools or persistent positive occult blood in the stool. It is mostly seen in polyp-like and ulcer-like early gastric cancer, which is caused by surface erosion of the lesion or invasion of capillaries by the cancer, resulting in small amount of bleeding for a long time, and also seen in various subtypes of early gastric cancer with flat lesions. It is not easily controlled by drug therapy. Elderly people without stomach diseases should be more alert to the possibility of gastric cancer once black stool appears. If the stool is tarry and the stool occult blood test is persistently positive, especially when it is not easily stopped even after general diet control or gastric disease medication, it is one of the important early gastric cancer symptoms. Unexplained emaciation, weakness and mental depression are also common but unspecific signs of gastric cancer and should be taken seriously when they are progressively worsening.