Sinus celiac disease is not a gastric ulcer. Sinus celiac disease means that the celiac disease is confined to the mucosal layer of the sinus and does not reach the muscular layer of the stomach, while 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 the gastric sinus erosion is not treated in time and further aggravated, it is likely that the erosion will develop to a deeper level and cause a gastric sinus ulcer when it reaches the muscular layer of the gastric sinus.