Stomach cancer is one of the most common malignant tumors, and its incidence rate is the first among all kinds of tumors in China. Early stage gastric cancer is mostly asymptomatic or has only mild symptoms. When clinical symptoms are obvious, the disease is already in advanced stage. Therefore, we should be very alert to the early symptoms of gastric cancer to avoid delaying the diagnosis and treatment. Early gastric cancer symptoms are not obvious and can be easily misdiagnosed. Early gastric cancer does not have characteristic symptoms, which are often manifested as hidden pain in the upper abdomen, abdominal distension, loss of appetite and so on. Since these symptoms are not unique to early gastric cancer, it is easy to be diagnosed as general gastric disease or chronic cholecystitis, and patients usually do not go to hospitals for consultation, and most of them choose to buy gastric medicine from pharmacies and take it orally by themselves. This is the main reason why patients are diagnosed late. Five warning signs of stomach cancer 1. Upper abdominal pain: This is the most common symptom of stomach cancer. It starts as intermittent vague pain and is often diagnosed as gastritis or ulcer disease. 2.Upper abdominal discomfort: It is mostly a feeling of fullness or burning. It can be temporarily relieved and recurring. 3, loss of appetite, belching and other indigestion symptoms: manifested as a feeling of fullness after eating and active restriction of diet, often accompanied by recurrent belching. 4, black stool or positive fecal occult blood: If black stool occurs without eating blood tofu and without taking some special medication that causes black stool (if the medication causes black stool, it is stated in the instructions), you should come to the hospital for examination as soon as possible. 5.Lack of energy, emaciation and anemia: this is another common but non-specific symptom of stomach cancer. Patients often show fatigue and weakness due to loss of appetite and blood loss in digestive tract. Therefore, once there are the above mentioned manifestations. Especially for people after 40 years old (35 years old for smokers), they should go to hospital for gastroscopy in time, which is the most effective way to detect early gastric cancer. Even without the above mentioned manifestations, it is beneficial for people over 45 years old to have gastroscopy every 1-2 years. Only early detection of cancer can lead to timely treatment and better prognosis.