A duodenal ulcer is a type of peptic ulcer that can appear in the duodenum. The duodenum is the upper part of the small intestine that’s connected directly to the stomach where it empties into the ...

Intraepithelial lymphocytosis is a complex immunological phenomenon. It commonly affects the gastrointestinal tract, where damage to the lining of tissue causes the number of lymphocytes (a type of ...

The duodenum is the first and shortest part of the small intestine. It’s located between your stomach and the jejunum, the next portion of your small intestine. The duodenum is shaped like a horseshoe ...