The cardia is the part of the interface between the esophagus and the stomach in the digestive tract, for the entrance to the upper end of the stomach. Cardia lesions refer to morphological or functional changes in this location, lesions have benign lesions and malignant lesions, the following common clinical lesions: 1, cardia achalasia: is a primary esophageal power disorder characterized by impaired relaxation of the lower esophageal sphincter and the absence of peristalsis in the body of the esophagus after swallowing, mainly manifested as dysphagia, food reflux and discomfort or pain in the lower posterior sternum, the preferred diagnosis The preferred diagnostic method is barium esophagogram; 2, cardia: refers to inflammation of the mucosa around the cardia, usually caused by gastroesophageal reflux, inflammation of the cardia due to gastric acid or bile stimulation, manifested as acid reflux, heartburn, epigastric pain and other symptoms, usually diagnosed by gastroscopy; 3, cardia cancer: usually refers to cancer occurring within 2 cm below the line of intersection of the esophagus and stomach, triggering factors mainly include gastroesophageal reflux disease, cardia inflammation, nitrosamine intake, etc. Clinical manifestations are pain under the glabella, eating disorder, choking sensation, frequent vomiting of mucus, difficulty in eating, wasting and other symptoms, and the diagnosis can be confirmed by imaging and pathological biopsy.