The incidence of cardia cancer is also very high in areas with a high incidence of esophageal cancer in my country. According to statistics from these areas and tumor research and treatment institutions, the ratio of esophageal cancer to cardia cancer is about 2:1. Due to inconsistent understanding of the scope of the cardia, there are different views on the definition of cardia cancer, resulting in large discrepancies in statistics. The correct definition of cardia cancer is adenocarcinoma that occurs in the gastric cardia, that is, within about 2 cm below the esophageal-gastric junction. It is a special type of gastric cancer and should be distinguished from lower esophageal cancer. However, it is different from gastric cancer in other parts of the body. It has its own anatomical and histological characteristics and clinical manifestations, unique diagnostic and treatment methods, and poor surgical treatment effects.