It is often mistaken as gastritis or ulcer disease and treated, and the symptoms may be temporarily relieved. If the lesion occurs in the gastric sinus, changes in duodenal function may occur, and rhythmic pain, similar to the symptoms of ulcer disease, may appear, which is often overlooked. Loss of appetite, wasting and weakness are also common but unspecific signs of early gastric cancer. If they appear together with symptoms of stomach pain and hepatitis can be ruled out, they should be paid particular attention. Early symptoms of gastric cancer may also include a feeling of fullness after eating and mild nausea. The tumor in cardia may start to appear as unpleasant eating, and gradually develop into difficulty in swallowing and vomiting. Blood in stool is also an early symptom of stomach cancer. Elderly people without stomach diseases should be more alert to the possibility of stomach cancer once black stool appears. About 80% of early gastric cancer patients have atypical clinical manifestations, which are similar to indigestion. They are often not taken seriously by patients. Therefore, if middle-aged patients have the above symptoms, they should seek early medical consultation.