| Abbreviation | Definition |
|---|---|
| SH | Social History |
| SIADH | Syndrome of Inappropriate Anti-Diuretic Hormone |
| SIL | Squamous Intraepithelial Lesion |
| SIO | Society for Integrative Oncology |
| SIO | Society of Interventional Oncology |
| SIOG | International Society of Geriatric Oncology (Société Internationale d'Oncologie Gériatrique) |
| SIOP | International Society of Paediatric Oncology |
| SMF | Standard Mammogram Form |
| SMF | Sub Mucosal Fibroid |
| SMOC | Southeastern Medical Oncology Center |
| SNOG | Sydney Neuro Oncology Group |
| SNP | Single Nucleotide Polymorphism |
| SOB | Short Of Breath |
| SOL | space-occupying lesion |
| SOSAP | Surgical Oncology Self-Assessment Program |
| SPOC | South Plains Oncology Consortium |
| SPOHNC | Support for People with Oral and Head and Neck Cancer |
| SROA | Society for Radiation Oncology Administrators |
| SS | Sarcoma Surgery |
| SSM | Superficial Spreading Melanoma |