It's different. Gastroesophageal reflux disease (GERD) refers to the abnormal reflux of stomach or duodenal fluids into the esophagus, causing a series of symptoms. Under endoscopy, severe esophageal inflammation and erosion can be seen, along with ulcers, fibrosis, etc. Prolonged episodes can lead to the development of Barrett's esophagus. On the other hand, reflux gastritis generally refers to bile reflux gastritis, which as the name suggests, is caused by the reflux of bile into the stomach. Endoscopically, swelling of the gastric mucosa can typically be seen, along with the presence of residual bile in the stomach, bile staining, and intestinal metaplasia, among others. Both conditions have clinically similar symptoms, including heartburn, acid reflux, and pain.