In the middle of the two rib arches is the xiphoid process, behind the xiphoid process is the diaphragm, and through the diaphragm is the stomach. The cardia is where the stomach connects to the esophagus, and is part of the stomach, the entrance to the stomach. The area between the corner of the stomach to the right and the pylorus is the sinus, and the pylorus is the outlet of the stomach. The human stomach consists of the cardia, fundus, body, sinus and pylorus. The cardia is connected to the esophagus and the fundus. If there is a lesion of the cardia, such as cardia loss of relaxation, there will be fullness behind the sternum, vomiting after eating, and dilatation of the upper end of the esophagus. Reflux esophagitis may occur if food refluxes into the esophagus when lying down and there is a burning sensation. The food that a person eats passes from the esophagus through the cardia into the stomach. The stomach has the role of temporary storage of food and initial digestion. The gastric sinus is an important cavity that holds food in the standing or sitting position. When food passes through here, due to the contraction and peristalsis of the stomach, some of the hard food may abrade the mucous membrane of the gastric sinus, resulting in the formation of erosive gastritis, or even gastric ulcers. Many gastric diseases such as gastritis and ulcers tend to occur in the gastric sinus. Therefore, you should pay attention to eating healthy, reasonable diet, light diet, minimize the stimulation of the stomach due to improper diet. In addition, you should eat more food with high nutritional content in your diet, which can enhance the body’s resistance and reduce bacterial or viral infections.