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 stomach cancer to avoid delaying the diagnosis and treatment. 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. The pain of gastric cancer is mostly irregular and has little relationship with diet. 2.Upper abdominal discomfort: it is mostly a feeling of fullness or burning. It can be temporarily relieved and recurring. Some patients have abdominal distension and other symptoms of indigestion, such as loss of appetite and belching: it is manifested as a feeling of fullness after eating and active restriction of diet, often accompanied by repeated belching. 4, black stool or positive fecal occult blood: If black stool occurs without eating blood tofu, taking bismuth and other drugs, you should come to the hospital for examination as soon as possible. Painless black stool should be more attention. 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. In case of stomach pain, stomach area discomfort or digestive tract discomfort, one should promptly go to the gastroenterology department of hospital for gastroscopy or laboratory examination to figure out the cause of the disease. Those who live irregularly, work intensely and busy, and eat pickled products or moldy food for a long time should have timely medical checkups and regular screening. Don’t take it lightly, it’s best to have a gastroscopy. Although many people’s stomach pain is general gastritis, there are few who eventually develop into gastric cancer. Certain chronic gastric diseases such as gastric ulcer, atrophic gastritis and gastric polyps are now recognized as pre-cancerous lesions. This reminds people with a family history of gastric disease and recurrent stomach pain symptoms to be more vigilant.