- Seniors' Health
- Sensory Integration Disorder
- Sepsis
- Septic Shock
- Septoplasty
- Serum Sickness
- Severe Combined Immunodeficiency
- Sex Change Surgery
- Sex Hormones Tests
- Sex Therapy
- Sexual Dysfunction
- Sexual Perversions
- Sexually Transmitted Diseases
- Shaken Baby Syndrome
- Shiatsu
- Shigellosis
- Shingles
- Shock
- Shortness of Breath
- Shy-Drager Syndrome
- Sick Sinus Syndrome
- Sickle Cell Disease
- Sideroblastic Anemia
- Sigmoidoscopy
- Sildenafil Citrate
- Silicosis
- Sinus Endoscopy
- Sinusitis
- Situs Inversus
- Sitz Bath
