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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.
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.