The gastric cardia is located at the junction of the esophagus and stomach, usually posterior to the 7th costal cartilage and to the left of the 11th thoracic vertebral body, and is an anatomical structure of the digestive system. The cardia is the part of the stomach that connects to the esophagus and is often localized by the lower edge of the lower esophageal sphincter because there is no specific sphincter corresponding to it in the anatomy. It is connected to the esophagus upward, with the right edge continuing with the lesser curvature of the stomach and the left edge continuing with the greater curvature of the stomach. The specific position is generally flat at the level of the 11th thoracic vertebra, about 10 cm from the anterior abdominal wall, and about 40 cm from the oral incisors. The state of muscle function at the cardia has an important influence on the swallowing of food and the digestive process, therefore, daily attention should be paid to avoid overeating or eating before going to bed, quitting smoking and restricting alcohol, and balanced nutrition, in order to prevent the occurrence of diseases such as gastroesophageal reflux disease (GERD).