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Gastroesophageal reflux disease (GERD), a chronic gastrointestinal disorder that occurs when stomach acid repeatedly backs up into the esophagus (the tube connecting the mouth and the stomach). While it’s common to experience acid reflux from time to time, repeated bouts may support a GERD diagnosis (doctors often consider acid reflux to be chronic if it occurs at least twice a week for several weeks).

Fulminant liver failure is loss of liver function that occurs rapidly and may require a liver transplant.

Gastrointestinal (GI) cancer is a term used to describe the type of cancers that affect the digestive system, or the gastrointestinal tract. 

Gastrointestinal stromal tumors (GIST) are rare, cancerous tumors that begin in the walls of the digestive tract.