Stomach acidity, heartburn and nausea all the time are not necessarily caused by stomach cancer, but can also be caused by other stomach diseases such as gastric ulcer and chronic gastritis. Stomach cancer may show symptoms of stomach acidity, heartburn and nausea, but the above symptoms alone cannot diagnose stomach cancer, which may also be caused by other diseases, such as gastric ulcer. Patients with damaged and destroyed gastric mucosa and lesions involving the muscular layer lead to depression and defect in the stomach wall, which may lead to perforation and bleeding in severe cases. In addition, erosion of gastric mucosa, superficial gastritis, atrophic gastritis, etc. can also lead to the above symptoms. In addition to burning sensation and acid reflux behind the sternum, patients in the early stage of gastric cancer may have upper abdominal discomfort, especially the pain may be aggravated after eating, accompanied by nausea, vomiting, burping, poor appetite, anemia and other symptoms. If symptoms of stomach acidity, heartburn and nausea occur frequently, patients should consult a gastroenterologist at the earliest possible time, and after a clear diagnosis is made, treatment should be carried out under the guidance of a doctor. In addition, patients should pay attention to a light diet and maintain a regular life in daily life.