Nearly half of the early gastric cancer patients have no clinical symptoms, only some of them have mild indigestion and other symptoms, such as vague discomfort in the 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 may occasionally appear. More than 80% of patients have pain in the upper abdomen; 2. About 1/3 of patients have stuffy stomach, epigastric discomfort, loss of appetite, indigestion, accompanied by pantothenia; 3. 1/3 of patients have no obvious digestive symptoms, but may have unexplained weight loss, emaciation and fatigue; 4. Some patients show symptoms such as pantothenia, heartburn, nausea, vomiting, belching or black stool. The more common symptoms of gastric cancer 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 at first and treated, and the symptoms may be temporarily relieved. If the lesion occurs in the gastric sinus, duodenal function may change and rhythmic pain may occur, similar to the symptoms of ulcer disease, which may also be misdiagnosed as duodenal ulcer and delay treatment. However, these symptoms can recur after a period of time. Therefore, if you have symptoms of epigastric discomfort, if you have other high-risk factors, or if you have recurrence after treatment, you must be vigilant and do further examination for early detection and early treatment. The symptoms of dyspepsia such as loss of appetite, anorexia, 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 it is not accompanied by stomach pain, especially if it occurs together with stomach pain and hepatitis can be excluded. Some patients automatically restrict their daily diet because of 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 in the cardia can start with eating disorder and gradually develop into swallowing difficulty and food reflux. Further development of sinus cancer may lead to vomiting due to pyloric obstruction. The above symptoms can be easily misdiagnosed as functional dyspepsia, so it is important to seek early medical attention and undergo gastroscopic examination to detect gastric cancer at an early stage. Early gastric cancer and progressive gastric cancer can both present with upper gastrointestinal bleeding, often in the form of black stools. A small number of early gastric cancers may present with mild upper gastrointestinal bleeding, i.e. black stools or persistent positive fecal occult blood. It is mostly seen in polyp-like and ulcer-like early gastric cancer, which is caused by the surface erosion of the lesion or the invasion of capillaries by the cancer, resulting in a small amount of bleeding for a long time, and also in the 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 is persistently 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 upper gastrointestinal barium meal X-ray to make a clear diagnosis. Unexplained emaciation, weakness and mental depression are also a group of common but unspecific signs of gastric cancer, and they are progressively getting worse. Some of them are secondary to dyspepsia, in which patients automatically restrict their daily diet due to bloating and belching after eating, resulting in weight loss and weakness. In addition, nausea and vomiting can also cause further loss of nutrition, resulting in malnutrition and aggravating the symptoms of emaciation and weakness. Of course, in the late stage of progressive gastric cancer, the wasting and weakness will be more obvious. In addition, it is worth mentioning that most gastric cancers occur on the basis of chronic gastritis (especially atrophic gastritis), Helicobacter pylori (HP) infection, residual gastritis, gastric polyp, gastric ulcer, etc. Therefore, some patients have a long history of chronic gastric disease, with symptoms such as epigastric discomfort and indigestion. On this basis, if the nature of pain, epigastric fullness, etc. has changed or increased recently, or the rhythm of pain related to diet has changed, or cannot be relieved after taking medication, or there is emaciation and weakness, then we should be more alert to the occurrence of gastric cancer. Most of the gastric cancer patients with emaciation and weakness are in the progressive stage of gastric cancer, and most of them have local or distant metastasis, and often have anemia. A variety of causes can cause vomiting, such as common duodenal bulb ulcer or post-ulcerative scar stenosis, reflux esophagitis, cardia ulcer, etc. Vomiting is often caused by pancreatic cancer or gastric cancer involving the pylorus, and vomit may include decomposed food, gastric juice or even coffee-like bloody fluid. Vomiting is usually a clinical manifestation of progressive gastric cancer and is often accompanied by weight loss. The appearance of swollen lymph nodes like soybean or peanut on the left clavicle, which are painless, hard and fixed, is a more specific sign of gastric cancer, and is mostly a sign of progressive gastric cancer with metastasis to the abdomen and other organs. Once swollen left supraclavicular lymph nodes are found, lymph node biopsy or cytological aspiration should be done immediately; gastroscopy and biopsy of gastric cancer lesions in multiple pieces and directions should be done for pathological examination, supplemented by barium gastric X-ray if necessary, to make a clear diagnosis immediately. Men over 50 years of age with gastric disease should be alerted and undergo relevant special examinations as soon as possible if they have recent recurrent epigastric pain, which is sometimes good and sometimes bad.