The cardia is located at the upper end of the cystic stomach wall, where the stomach meets the esophagus and is the entrance to the stomach. The cardia is located at the upper end of the cystic stomach wall, where the stomach meets the esophagus. The tubular esophagus is down to the cardia, and the cardia extends down to the wall of the cystic stomach, so the cardia is the entrance to the stomach. The role of the cardia is to secrete neutral mucus, promote digestion and protect the gastric mucosa. If you suffer from cardia disease, such as carditis, cardia cancer, cardia polyp, etc., you will experience digestive symptoms such as nausea, vomiting, and abdominal distension. In case of abnormal results of gastroscopy and other tests, it is recommended to consult a doctor in time to clarify the cause of the disease and carry out targeted treatment or therapy with the help of a doctor.