Heartburn is not necessarily a manifestation of gastric cancer, it is not a typical manifestation of gastric cancer. Early gastric cancer is usually asymptomatic. Patients may show weight loss and epigastric pain, as well as anemia, lack of appetite, anorexia, etc. With the emergence of complications and metastasis, symptoms such as difficulty in swallowing may appear, which need to be confirmed by gastroscopy, X-ray examination, etc.