Upper GI endoscopy is a procedure to view the upper digestive tract, which includes the esophagus, stomach & beginning of the small intestine.| AGA GI Patient Center
Gastroesophageal reflux disease (GERD), or just acid reflux, is when stomach acid frequently flows back into the esophagus. Heartburn is the most common symptom of GERD.| AGA GI Patient Center
Barrett’s esophagus is when the cells lining the esophagus — the tube connecting the mouth to the stomach — change into the cells lining the intestine.| AGA GI Patient Center