| Abbreviations | Meaning |
 | GRD | Gastroesophageal Reflux Disease; Gender Role Definition |
| GEPG | Gastroesophageal Pressure Gradient |
| I-TYPE | Intestinal Type |
| PAIN | Pyoderma Gangrenosum, Aphthous Stomatitis, Inflammatory Eye Disease, Erythema Nodosum [disorders Associated With Inflammatory Bowel Disease] |
| GU | Gastric Ulcer; Genitourinary; Glucose Uptake; Glycogenic Unit; Gonococcal Urethritis; Gravitational Ulcer; Guanethidine |
| UGIS | Upper Gastrointestinal Series |
| GCA | Gastric Cancer Area; Giant Cell Arteritis |
| IPSID | Immunoproliferative Small Intestine Disease |
| OGD | [o]esophago-gastro-duodenoscopy |
| PGA | Pancreaticogastrostomy |
| SLUDGE | Salivation, Lacrimation, Urination, Defecation, Gastrointestinal Upset, Emesis |
| LB | Large Bowel |
| HHG | Hypertrophic Hypersecretory Gastropathy; Hypogonadotropic Hypogonadism |
| EOG | Electro-oculogram, Electro-oculography; Electro-olfactogram, Electro-olfactography; Eosinophilic Gastroenteritis; Ethylene Oxide Gas |
| BO | Bowels |
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