Stomach ulcers, Ulcer symptoms, Gastric ulcers, Duodenal ulcers, Peptic ulcers, Peptic ulcer disease, Gastric ulcer, Bleeding ulcer. Root Cause of Disease Duodenal ulcers are a common cause of abdominal pain. Once treated, they usually get better in a matter of weeks. A duodenal ulcer is a sore that forms in the lining of the duodenum….