Gastric sinus erosion is more severe compared to gastric ulcer. Sinus celiac disease means that the celiac disease is confined to the mucosal layer of the gastric sinus and does not reach the muscular layer of the stomach. In contrast, gastric ulcer means that the ulcer has gone beyond the mucosal layer of the stomach and reached the muscular layer of the stomach, so gastric ulcer is relatively more serious. If sinus erosion is not treated in time and further aggravated, it is likely that the erosion will progress to a deeper level and cause a sinus ulcer when it reaches the muscular layer of the gastric sinus. Gastric ulcer can easily be complicated by bleeding, perforation, obstruction, and cancer, so patients are advised to treat it promptly. Whether it is sinus erosion or gastric ulcer, you need to cooperate with your doctor to give regular medication, especially for gastric ulcer, to avoid serious complications.