Bile reflux gastritis is mainly caused by the retrograde movement of bile, which enters the stomach through the pylorus, leading to a series of symptoms such as abdominal distension, abdominal pain, acid reflux, nausea, vomiting, dry mouth, and a bitter taste. This condition should not be directly related to diarrhea, but it is possible for patients with bile reflux gastritis to experience symptoms of diarrhea. This is more commonly seen in patients after gallbladder removal surgery. Due to the loss of the gallbladder's function to store bile, bile not only retrogrades into the stomach via the duodenum but can also directly enter the intestines, stimulating the intestinal mucosa and thus leading to symptoms of diarrhea.