Early stage gastric cancer is mostly characterized by epigastric discomfort, such as mild stomach pain, swelling and heaviness, and sometimes vague pain in the heart fossa, which is often diagnosed and treated as gastritis or ulcer disease at first, and the symptoms may be temporarily relieved. If the lesion occurs in the gastric sinus, changes in duodenal function may occur, with rhythmic pain, similar to the symptoms of ulcer disease, which is also easily misdiagnosed as duodenal ulcer and delayed treatment. However, all these symptoms can recur after a period of time. Therefore, anyone with symptoms of epigastric discomfort, if accompanied by other high-risk factors, or with recurrent recurrences after treatment, must be vigilant and undergo further investigations with a view to early detection and early treatment. Indigestion symptoms such as loss of appetite, anorexia and poor appetite, nausea and vomiting, bloating after eating, belching and acid reflux are also a group of common but non-specific early signs of gastric cancer. Loss of appetite may be an early symptom of gastric cancer and is not accompanied by symptoms of stomach pain, especially if it occurs simultaneously with stomach pain and hepatitis can be excluded. Some patients automatically restrict their daily diet because of bloating and belching after eating, resulting in weight loss, emaciation and weakness. Early symptoms of gastric cancer may also include a feeling of fullness after eating and mild nausea. Tumor of cardia may start with unpleasant eating and gradually develop into difficulty in swallowing and food reflux. Further development of gastric sinus cancer may lead to vomiting due to pyloric obstruction.