The early stage of gastric cancer usually has no obvious symptoms, and the conscious symptoms appear only when gastric cancer develops to a certain degree. The symptoms are generally non-specific, such as distending pain in upper abdomen, hidden pain, nausea and discomfort, belching, wasting, loss of appetite, etc. Some early gastric cancers may also show ulcers, and the pain is regular, which can be reduced by medication, etc. Some early gastric cancers are cancerous changes on chronic atrophic gastritis and other diseases, and the symptoms of gastric disease have existed for a long time and repeatedly occurred several times, thus making patients and doctors relax their vigilance and delay treatment. Some early gastric cancers can show vomiting blood and black stool, or have difficulty in swallowing. Mild discomfort in the upper abdomen is the most common initial symptom, which is similar to indigestion or gastritis and can be easily ignored. The common symptoms of stomach cancer in order are: pain or discomfort in upper abdomen (74.7%), emaciation (73.7%), loss of appetite (57.5%), vomiting (57.2%), black stool (32.2%), abdominal mass (23.7%), difficulty in swallowing (19.9%), vomiting blood (15.4%), and other symptoms such as bloating, weakness, anemia, edema and fever. The common symptoms of early gastric cancer are as follows: 1. Upper abdominal distension and discomfort: it is the most common symptom. It can be mild, vague or dull pain in the abdomen, partial or rhythmic pain, which can be relieved after eating, and in some people, abdominal distension is the main symptom. 2.Nausea or vomiting: It is common in cancer of the gastric sinus. 3.Loss of appetite: loss of appetite, weakness, malnutrition, etc. 4.Vomiting blood and black stool: manifested as occult blood and black stool in the stool, and occasionally vomiting blood to the doctor. 5. Difficulty in swallowing: Patients with pancreatic cancer often have difficulty in swallowing. 6.Diarrhea: stools are dilute.