- SAD see Seasonal Affective Disorder
- Safety
- Safety, Child see Child Safety
- Salivary Gland Disorders
- Salmonella Infections
- Salt see Dietary Sodium
- Sarcoidosis
- Sarcoma, Ewing's see Bone Cancer
- Sarcoma, Soft Tissue see Soft Tissue Sarcoma
- SARS see Severe Acute Respiratory Syndrome
- Scabies
- Scarlet Fever see Streptococcal Infections
- Scars
- Schizophrenia
- School Health
- Sciatica
- SCID see Immune System and Disorders
- Scleroderma
- Scoliosis
- Screening Tests see Health Screening
- Screening, Newborn see Newborn Screening
- Seasickness see Motion Sickness
- Seasonal Affective Disorder
- Second Opinion see Patient Rights ; Surgery ; Talking With Your Doctor
- Secondhand Smoke
- Seizures
- Selenium see Minerals
- Semen see Testicular Disorders
- Senility see Dementia
- Seniors' Fitness see Exercise for Seniors
- Seniors' Health
- Seniors' Nutrition see Nutrition for Seniors
- Sepsis
- Septic Arthritis see Arthritis
- Septic Shock see Sepsis
- Septic Systems see Water Pollution
- Septicemia see Sepsis
- Severe Acute Respiratory Syndrome
- Severe Combined Immunodeficiency see Immune System and Disorders
- Sewage see Water Pollution
- Sex see Sexual Health
- Sexual Abuse of Children see Child Sexual Abuse
- Sexual Assault see Rape
- Sexual Health
- Sexual Health, Teen see Teen Sexual Health
- Sexually Transmitted Diseases
- Shaken Baby Syndrome see Child Abuse
- Shaking Palsy see Parkinson's Disease
- Shingles
- Shock see First Aid
- Shoes see Foot Health
- Shortness of Breath see Breathing Problems
- Shoulder Injuries and Disorders
- Shy-Drager Syndrome see Autonomic Nervous System Disorders ; Low Blood Pressure
- Sickle Cell Anemia
- SIDS see Sudden Infant Death Syndrome
- Sinusitis
- Sjogren's Syndrome
- Skin Aging
- Skin Cancer
- Skin Conditions
- Skin Pigmentation Disorders
- Skin Rash see Rashes
- Skull Injuries see Head and Brain Injuries
- SLE see Lupus
- Sleep Apnea
- Sleep Disorders
- Sleep-disordered breathing see Sleep Apnea
- Slipped Disk see Herniated Disk
- SMA see Spinal Muscular Atrophy
- Small Cell Lung Cancer see Lung Cancer
- Small Intestine Cancer see Intestinal Cancer
- Smallpox
- Smelling Disorders see Taste and Smell Disorders
- Smokeless Tobacco
- Smoking
- Smoking and Youth
- Smoking Cessation
- Smoking in Pregnancy see Pregnancy and Substance Abuse
- Smoking, Passive see Secondhand Smoke
- Snake Bites see Animal Bites
- Snoring
- Snuff see Smokeless Tobacco
- Social Phobia see Phobias
- Sodium, Dietary see Dietary Sodium
- Soft Tissue Sarcoma
- Sonogram see Ultrasound
- Sore Throat
- South American Trypanosomiasis see Chagas Disease
- Spasmodic Torticollis see Dystonia
- Spasticity see Neuromuscular Disorders
- Speech and Communication Disorders
- Spider Bites see Insect Bites and Stings
- Spider Veins see Varicose Veins
- Spina Bifida
- Spinal Cord Diseases
- Spinal Cord Injuries
- Spinal Diseases
- Spinal Muscular Atrophy
- Spinal Stenosis
- Spit Tobacco see Smokeless Tobacco
- Spleen Diseases
- Splenic Diseaess see Spleen Diseases
- Splenomegaly see Spleen Diseases
- Spondylitis, Ankylosing see Ankylosing Spondylitis
- Spondylolisthesis see Spinal Diseases
- Spontaneous Abortion see Pregnancy Loss
- Sports Fitness
- Sports Injuries
- Sports Safety
- Spouse Abuse see Domestic Violence
- Sprains and Strains
- SSRIs see Antidepressants
- Stammering see Stuttering
- Staphylococcal Infections
- Statistics see Health Statistics
- Staying Healthy see Healthy Living
- STD see Sexually Transmitted Diseases
- Steele-Richardson-Olszewski Syndrome see Progressive Supranuclear Palsy
- Stein-Leventhal Syndrome see Ovarian Cysts
- Stem Cell Transplantation see Stem Cells
- Stem Cells
- Stepfamilies see Family Issues
- Sterility see Infertility
- Sterilization see Birth Control
- Steroids
- Steroids, Anabolic see Anabolic Steroids
- Still's Disease see Juvenile Rheumatoid Arthritis
- Stillbirth see Pregnancy Loss
- Stoma see Ostomy
- Stomach Cancer
- Stomach Disorders
- Stomach Flu see Gastroenteritis
- Stomach Stapling see Weight Loss Surgery
- Stomach Ulcer see Peptic Ulcer
- Stool Soiling see Toilet Training
- Strabismus see Eye Diseases
- Strep Throat see Streptococcal Infections
- Streptococcal Infections
- Stress
- Stroke
- Stuttering
- Substance Abuse see Alcoholism ; Drug Abuse
- Substance Abuse in Pregnancy see Pregnancy and Substance Abuse
- Sudden Cardiac Death see Cardiac Arrest
- Sudden Infant Death Syndrome
- Sugar see Carbohydrates
- Sugar Diabetes see Diabetes
- Sugar Substitutes see Carbohydrates
- Suicide
- Sun Exposure
- Sunburn see Sun Exposure
- Sunstroke see Heat Illness
- Surgery
- Surgery, Plastic see Plastic and Cosmetic Surgery
- Swallowing Disorders
- Sweat
- Sweeteners, Artificial see Carbohydrates
- Swimmer's Ear see Ear Infections
- Swollen Glands see Lymphatic Diseases
- Syncope see Fainting
- Syndrome X (Cardiac) see Angina
- Syndrome X (Metabolic) see Metabolic Syndrome
- Syphilis
- Syringomyelia
- Systemic Lupus Erythematosus see Lupus
- Systemic Sclerosis see Scleroderma
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