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Short bowel syndrome is a group of problems. They happen to people who have had a large part of their small intestine removed.
Your bile and pancreative juices flow through a duct that is opened and closed by a valve called the sphincter of Oddi. If this valve goes into spasm, you end up with severe belly pain.
An ulcer is an open sore (lesion). It’s normally found on the skin or mucous membranes. A peptic ulcer is in the lining of the stomach or duodenum. A gastric ulcer is in the stomach. A duodenal ulcer is in the duodenum.