The location in the middle of the chest is mainly the gastroesophageal junction, including the lower esophagus, cardia, fundus, and the left outer lobe of the liver. If there is pain in the middle of the chest, it is usually considered to be a stomach disease or gallbladder disease. Stomach disorders occur when there is vague pain below the chest and in the upper abdomen, distension, nausea, vomiting, acid reflux, belching, and hiccups. If there is bleeding in the mucosa of the stomach, it can also lead to black stools. Gastroscopy can be performed to diagnose the problem. Generally, inflammatory lesions or ulcerative lesions in the stomach can be detected, and oral medication such as omeprazole or rabeprazole is required. If a lump is found in the stomach, it may be caused by gastric cancer, and a small amount of tissue should be taken out for pathological examination. Gallbladder stones combined with inflammation of the gallbladder may also cause pain under the subxiphoid process, and the pain is generally more intense in nature, with fixed pressure pain in the right upper abdomen, and can be diagnosed by hepatobiliary ultrasound examination.