Collagen is an important protein that can be found throughout your body. In fact, it is found in all the connective tissues in your body ranging from your skin and bones, all the way down to your organs and blood vessels. Collagen functions several different ways in your body.
Upper gastrointestinal bleeding. Upper gastrointestinal bleeding (sometimes upper GI, UGI bleed, Upper gastrointestinal hemorrhage, gastrorrhagia) is gastrointestinal bleeding in the upper gastrointestinal tract, commonly defined as bleeding arising from the esophagus, stomach, or duodenum. Blood may be observed in vomit (hematemesis) or in altered form in the stool (melena).
Guide. An upper gastrointestinal (UGI) endoscopy is a procedure that allows your doctor to look at the inside lining of your esophagus, your stomach, and the first part of your small intestine (duodenum).A thin, flexible viewing tool called an endoscope (scope) is used.hy It Is Done. An upper gastrointestinal (UGI) endoscopy may be done to: 1  Find problems in the upper gastrointestinal (GI) tract. 2  These problems can include: 3  Inflammation of the esophagus (esophagitis) or the stomach (gastritis). 4  Gastroesophageal reflux disease (GERD) . 5  A narrowing (stricture) of the esophagus.