- Salmonella
- Sarcoidosis
- SARS : Symptoms
- Scabies
- Scarlet Fever
- Schistosomiasis
- Schizophrenia
- Sciatica
- Scleroderma
- Scorpion Bites
- Seborrheic Dermatitis
- Seizures
- Seniors' Health see Geriatrics
- Sepsis / Septicemia
- Severe Acute Respiratory Syndrome see SARS
- Sexually Transmitted Diseases
- Shin Splints
- Shingles : Ear | Eye
- Sickle Cell Anemia
- Sinus Infection
- Sjogrens Syndrome
- Skin Cancer
- Skin Diseases
- Skin Diseases & HIV
- Skin Infections, Viral
- Skin Problems / Tattoos
- Skin Rashes see Childrens Skin Rashes
- Sleep Apnea
- Sleep Disorders
- Sleeping Sickness
- Slipped Disk see Herniated Disc
- Smallpox
- Smoking & Disease : Lungs | Oral / Throat
- Sore Throat
- Spastic Bowel see Irritable Bowel Syndrome
- Speech Disorders
- Spider Bites
- Spider Veins
- Spondylitis, Ankylosing see Ankylosing Spondylitis
- Sports Injuries / Sports Medicine
- Staph Infection
- STD's
- Stem Cells
- Stevens-Johnson Syndrome
- Stills Disease
- Stomach Flu
- Stomach Stapling see Gastric Bypass
- Stomach Ulcers
- Strep Infections
- Strep Throat
- Stretch Marks
- Stroke
- Sun Poisoning
- Sunstroke see Heat Stroke
- Surgery
- Swallowing Problems see Dysphagia
- Swimmers Itch
- Swine Flu Symptoms
- Symptoms, Medical
- Syphilis
- Systemic Lupus Erythematosus see Lupus