| Abbreviation | Definition |
|---|---|
| IDWG | Interdialytic Weight Gain (kidney failure) |
| IFIS | Intraoperative Floppy Iris Syndrome |
| IGS | Irritable Gripe Syndrome |
| IHHS | Idiopathic Hemiconvulsion Hemiplegia Syndrome |
| ILS | Imaginary Lat Syndrome |
| IOIS | Idiopathic Orbital Inflamatory Syndrome |
| IRDS | Idiopathic Respiratory Distress Syndrome |
| IRDS | Infant Respiratory Distress Syndrome |
| IRDS | Isease Or Respiratory Distress Syndrome |
| IRS | Internal Responsibility Syndrome |
| IRS | Irritable Rabbit Syndrome |
| IUES | Idiopathic uveal effusion syndrome |
| IVCS | Iliac Vein Compression Syndrome |
| IVCS | Inferior Vena Cava Syndrome |
| JLNS | Jervell and Lange-Nielsen Syndrome |
| JS | Job Syndrome |
| KFS | Klippel Feil Syndrome |
| KLS | Kleine Levin Syndrome |
| KOS | Kaufman Oculocerebrofacial Syndrome |
| KS | Kartagener Syndrome |