- SAD see Seasonal Affective Disorder
- Safe Opioid Use
- Safety
- Safety, Child see Child Safety
- Salivary Gland Cancer
- Salivary Gland Disorders
- Salmonella Infections
- Salt see Sodium
- Sarcoidosis
- Sarcoma, Ewing's see Bone Cancer
- Sarcoma, Soft Tissue see Soft Tissue Sarcoma
- SCA see Sudden Cardiac Arrest
- Scabies
- Scapula Injuries see Shoulder Injuries and Disorders
- 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
- Seasonal Allergies see Hay Fever
- Seborrheic Dermatitis see Dandruff, Cradle Cap, and Other Scalp Conditions
- Second Opinion see Patient Rights; Surgery; Talking With Your Doctor
- Secondhand Smoke
- Seizures
- Selenium see Minerals
- Self-Harm
- Semen see Testicular Disorders
- Seminoma see Testicular Cancer
- Senility see Dementia
- Seniors' Fitness see Exercise for Older Adults
- Seniors' Mental Health see Older Adult Mental Health
- Seniors' Nutrition see Nutrition for Older Adults
- Sepsis
- Septic Arthritis see Infectious Arthritis
- Septic Shock see Sepsis; Shock
- Septic Systems see Water Pollution
- Septicemia see Sepsis
- 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
- Sexual Health
- Sexual Health, Teen see Teen Sexual Health
- Sexual Problems in Men
- Sexual Problems in Women
- Sexually Transmitted Diseases see Sexually Transmitted Infections
- Sexually Transmitted Infections
- Shaken Baby Syndrome see Child Abuse
- Shaking Palsy see Parkinson's Disease
- Shellfish Allergy see Food Allergy
- Shingles
- Shock
- Shoes see Foot Health
- Shortness of Breath see Breathing Problems
- Shoulder Dislocation see Dislocated Shoulder
- Shoulder Impingement see Rotator Cuff Injuries
- Shoulder Injuries and Disorders
- Shy-Drager Syndrome see Autonomic Nervous System Disorders; Low Blood Pressure
- Sickle Cell Anemia see Sickle Cell Disease
- Sickle Cell Disease
- SIDS see Sudden Infant Death Syndrome
- Sigmoidoscopy see Colonoscopy
- Singultus see Hiccups
- Sinus Cancer see Nasal Cancer
- Sinus Infection see Sinusitis
- Sinusitis
- Sjogren's Disease see Sjogren's Syndrome
- Sjogren's Syndrome
- Skin Aging
- Skin Cancer
- Skin Conditions
- Skin Infections
- Skin Pigmentation Disorders
- Skin Rash see Rashes
- Skull Fractures see Head Injuries
- Skull Injuries see Head Injuries
- SLE see Lupus
- Sleep Apnea
- Sleep Disorders
- Sleep Hygeine see Healthy Sleep
- Sleep-disordered Breathing see Sleep Apnea
- Slipped Disk see Herniated Disk
- SMA see Spinal Muscular Atrophy
- Small Cell Lung Cancer see Lung Cancer
- Small for Gestational Age see Birth Weight
- Small Intestine Cancer see Intestinal Cancer
- Small Intestine Disorders
- Smallpox
- Smelling Disorders see Taste and Smell Disorders
- Smoke Inhalation see Inhalation Injuries
- Smokeless Tobacco
- Smoking
- Smoking and Youth
- Smoking Cessation see Quitting Smoking
- Smoking in Pregnancy see Pregnancy and Substance Use
- Smoking, Passive see Secondhand Smoke
- Snake Bites see Animal Bites
- Snoring
- SNRI see Antidepressants
- Snuff see Smokeless Tobacco
- Social Anxiety Disorder see Phobias
- Social Phobia see Phobias
- Sodium
- Soft Tissue Sarcoma
- Sore Throat
- South American Trypanosomiasis see Chagas Disease
- Spasmodic Torticollis see Dystonia
- Spasticity see Neuromuscular Disorders
- Specific Learning Disorder see Learning Disabilities
- Speech and Communication Disorders
- Speech and Language Problems in Children
- Sperm Donation see Assisted Reproductive Technology
- Spider Bites
- Spider Veins see Varicose Veins
- Spina Bifida
- Spinal Cord Diseases
- Spinal Cord Injuries
- Spinal Muscular Atrophy
- Spinal Stenosis
- Spine Injuries and Disorders
- Spit Tobacco see Smokeless Tobacco
- Spleen Diseases
- Splenic Diseaess see Spleen Diseases
- Splenomegaly see Spleen Diseases
- Splinters see Foreign Bodies
- Spondylitis, Ankylosing see Ankylosing Spondylitis
- Spondylolisthesis see Spine Injuries and Disorders
- Spontaneous Abortion see Miscarriage
- Sports Fitness
- Sports Injuries
- Sports Safety
- Spouse Abuse see Intimate Partner Violence
- Sprains and Strains
- Squint see Eye Movement Disorders
- SSRIs see Antidepressants
- Stammering see Stuttering
- Staphylococcal Infections
- Statins
- Statistics see Health Statistics
- Staying Healthy see Healthy Living
- STDs see Sexually Transmitted Infections
- Steele-Richardson-Olszewski Syndrome see Progressive Supranuclear Palsy
- Stein-Leventhal Syndrome see Polycystic Ovary Syndrome
- Stem Cell Transplantation see Stem Cells
- Stem Cells
- Stepfamilies see Family Issues
- Sterility see Infertility
- Sterilization see Tubal Ligation; Vasectomy
- Steroids
- Steroids, Anabolic see Anabolic Steroids
- Still's Disease see Juvenile Arthritis
- Stillbirth
- STIs see Sexually Transmitted Infections
- Stoma see Ostomy
- Stomach Ache see Abdominal Pain; Stomach Disorders
- Stomach Cancer
- Stomach Disorders
- Stomach Flu see Gastroenteritis
- Stomach Stapling see Weight Loss Surgery
- Stomach Ulcer see Peptic Ulcer
- Stool see Bowel Movement
- Strabismus see Eye Movement Disorders
- Strep Throat see Streptococcal Infections
- Streptococcal Infections
- Streptococcus Pneumoniae Infections see Pneumococcal Infections
- Stress
- Stress Incontinence see Urinary Incontinence
- Stroke
- Stroke Rehabilitation
- Stuttering
- Stye see Eyelid Disorders
- Subarachnoid Hemorrhage see Hemorrhagic Stroke
- Substance Abuse in Pregnancy see Pregnancy and Substance Use
- Substance use see Alcohol Use Disorder (AUD); Drug Use and Addiction; Drugs and Young People
- Sudden Cardiac Arrest
- Sudden Cardiac Death see Sudden Cardiac Arrest
- Sudden Infant Death Syndrome
- Sugar see Carbohydrates
- Sugar Diabetes see Diabetes; Diabetes Type 2
- Sugar Substitutes see Carbohydrates
- Suicide
- Sun Exposure
- Sunburn see Sun Exposure
- Sunscreen see Sun Exposure
- Sunstroke see Heat Illness
- Surgery
- Surgery, Plastic see Plastic and Cosmetic Surgery
- Surrogate see Assisted Reproductive Technology
- Swallowing Disorders
- Sweat
- Sweeteners, Artificial see Carbohydrates
- Swelling see Edema
- Swimmer's Ear see Ear Infections
- Swine Flu see H1N1 Flu (Swine Flu)
- 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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