Usually stomach cancer patients have no obvious signs, but patients with precancerous lesions may have symptoms such as indigestion, heartburn, etc. With the development of the disease, patients may also show anorexia and black stools. Usually, stomach cancer patients have no obvious aura, but only some patients with precancerous lesions may have precancerous symptoms such as dyspepsia, heartburn, etc. Some patients may also have epigastric pain, etc. With the development of the disease, about 80% of the patients may suffer from stomach cancer. As the disease develops, about 80% of patients have no symptoms in the early stage, and only some of them may have minor discomforts such as fullness, indigestion, etc., which are easy to be neglected. When the patient’s condition develops to the middle stage, it may appear as pain in the left upper abdomen, a few patients may have pain in eating, and some patients may also have anorexia, anemia, etc., and a mass may also be detected in the upper abdomen. If the disease develops to the advanced stage, the pain will be intensified, and there will be black stool, vomiting blood, cachexia and other phenomena. It is recommended that patients pay more attention to their own symptoms, and if the above symptoms occur, it is necessary to pay attention to them, consult a doctor in a timely manner, and actively treat them after a clear diagnosis.