The main difference between reflux esophagitis and esophagitis is that esophagitis has a broader range, and reflux esophagitis is just one type of esophagitis. Esophagitis can be caused by many factors, as it involves inflammation changes occurring after multiple factors have damaged the esophageal mucosa. Based on different etiological factors, it can be divided into reflux esophagitis, radiation esophagitis, infectious esophagitis, eosinophilic esophagitis, drug-induced esophagitis, and radiation esophagitis. Reflux esophagitis is the most common type of esophagitis, primarily caused by the relaxation of the lower esophageal sphincter, which leads to the reflux of stomach and duodenal contents into the esophagus causing inflammatory changes. This may be related to factors such as obesity, smoking, alcohol consumption, and a high-fat diet.