| Abbreviation | Definition |
|---|---|
| FTHS | Frank-Ter Haar Syndrome |
| FUS | Feline Urologic Syndrome |
| FXTAS | Fragile X Tremor Ataxia Syndrome |
| GAS | Gear Acquiring Syndrome |
| GBS | Guillain Barre Syndrome |
| GBS | GuillainBarré syndrome |
| GBS | Guillain–Barré syndrome |
| GCRS | Gynecological Chylous Reflux Syndrome |
| GDS | Geek Defensive Syndrome |
| GDS | Good Debater Syndrome |
| GMS | Good Man Syndrome |
| GOWI | Getting Old With Issues |
| GRRS | Game Related Rage Syndrome |
| GRS | Golabi Rosen Syndrome |
| GSM | Genitourinary Syndrome of Menopause |
| GSSN | Goldenhar Syndrome Support Network |
| GTPS | Greater trochanteric pain syndrome |
| GWDS | Grant Writing Derangement Syndrome |
| GWS | Gulf War Syndrome |
| GYDS | Gan yin deficiency syndrome |