Esophageal mucosal bulge is a submucosal lesion that is associated with esophagitis, mucosal polyps, smooth muscle tumors, and other factors. If the bulge is found in the mucosal area of the esophagus during a gastric examination in the hospital. First, it should be considered to be caused by a local lesion, more commonly known as inflammation of the esophageal area. Esophagitis mainly refers to the stimulation of the superficial and deep parts of the esophageal mucosa, which leads to edema and congestion of the mucosa, thus causing local inflammation, and the mucosal area is found to be bulging after the examination in the hospital. Secondly, the presence of hyperplastic polyps in the mucosal muscle layer may also lead to localized mucosal bulging. If there are smooth muscle tumors below the mucosa of the esophagus or gliomas in the esophagus, they can cause a bulge in the mucosa, and the cause can be clarified by endoscopic examination with esophageal ultrasound.