Patients with duodenal ulcers who experience diarrhea should undergo a routine stool examination to rule out diarrhea caused by intestinal infections. If there is no obvious organic disease in the intestines, the diarrhea associated with duodenal ulcers may be due to excessive secretion of stomach acid. It is advisable to consider using medications that suppress the secretion of stomach acid, such as proton pump inhibitors like omeprazole or lansoprazole, etc. You can also use aluminum magnesium carbonate, sucralfate, etc., to protect the stomach lining. For patients with abdominal distension, medications like mosapride can be used to promote gastric motility treatment.