Gastric cancer is one of the most common malignant tumors in clinical practice, accounting for the first place of all malignant tumors in China and half of the whole digestive tract tumors. 1.Indigestion syndrome is manifested as upper abdominal distension and discomfort, burning and fullness (more obvious after meals), followed by loss of appetite. As the symptoms of dyspepsia can also be seen in gastritis and gastric ulcer, a gastroscopy must be done for differential diagnosis when the above symptoms appear. 2, vague pain in the stomach and epigastrium often manifests as vague pain in the fossa of the heart, so many people mistake it for angina pectoris and often go to cardiology. This performance is similar to stomach cramps and acute gastritis, but the latter two diseases can be relieved with antispasmodic and analgesic drugs, while stomach cancer is not effective. 3.Anemia and emaciation People who have always been in good health and have recently developed unexplained anemia and emaciation should pay great attention and do fecal occult blood test. 4.If the occult blood test is positive, it indicates bleeding in stomach or intestine, and gastroscopy should be done immediately to make a clear diagnosis. The above four types of symptoms can appear alone or at the same time, no matter what kind of symptoms appear, should pay attention to, quickly go to do a gastroscopy, take a piece of tissue to do a pathological examination, you can make a clear diagnosis.