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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).

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.

Gestational diabetes occurs when a pregnant woman has high blood sugar levels.  

Giant cell arteritis causes the arteries to become inflamed and narrowed, reducing blood flow.

Glioma is a common type of tumor originating in the brain. 

A type of kidney disease, glomerulonephritis is an inflammation of the tiny filters that remove waste products from the blood.