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  1. Sacral dimple
  2. Sacroiliitis
  3. SAD (See: Seasonal affective disorder (SAD))
  4. Salivary gland cancer
  5. Salmonella infection
  6. Sarcoidosis
  7. Sarcoma
  8. Sarcoma, bone cancer (See: Bone cancer)
  9. Sarcoma, soft tissue (See: Soft tissue sarcoma)
  10. Scabies
  11. SCAD (See: Spontaneous coronary artery dissection)
  12. Scalded mouth syndrome (See: Burning mouth syndrome)
  13. Scarlatina (See: Scarlet fever)
  14. Scarlet fever
  15. Schizoaffective disorder
  16. Schizoid personality disorder
  17. Schizophrenia
  18. Schizophrenia, adolescent (See: Childhood schizophrenia)
  19. Schizophrenia, childhood (See: Childhood schizophrenia)
  20. Schizophrenia, juvenile (See: Childhood schizophrenia)
  21. Schizotypal personality disorder
  22. Sciatica
  23. Scleroderma
  24. Scleroderma, limited (See: Limited scleroderma (CREST syndrome))
  25. Sclerosing cholangitis (See: Primary sclerosing cholangitis)
  26. Sclerosing mesenteritis
  27. Sclerosis, amyotrophic lateral (See: Amyotrophic lateral sclerosis)
  28. Sclerosis, multiple (See: Multiple sclerosis)
  29. Sclerosis, systemic (See: Scleroderma)
  30. Scoliosis
  31. Scorpion stings
  32. Scrotal masses
  33. Seasonal affective disorder (SAD)
  34. Seasonal allergy (See: Hay fever)
  35. Sebaceous cysts (See: Epidermoid (sebaceous) cysts)
  36. Seborrheic dermatitis
  37. Seborrheic keratosis
  38. Secondary hypertension
  39. Seizure disorder (See: Epilepsy)
  40. Seizure, absence (See: Absence seizure)
  41. Seizure, febrile (See: Febrile seizure)
  42. Seizure, grand mal (See: Grand mal seizure)
  43. Seizure, petit mal (See: Absence seizure)
  44. Seizure, temporal lobe (See: Temporal lobe seizure)
  45. Selective IgA deficiency
  46. Self-injury/cutting
  47. Separated shoulder
  48. Separation anxiety
  49. Sepsis
  50. Septal defect, atrial (See: Atrial septal defect)
  51. Septal defect, atrioventricular (See: Atrioventricular canal defect)
  52. Septal defect, ventricular (See: Ventricular septal defect)
  53. Septic arthritis
  54. Serotonin syndrome
  55. Severe acute respiratory syndrome (See: Severe acute respiratory syndrome (SARS))
  56. Severe acute respiratory syndrome (SARS)
  57. Severe brain injury, coma (See: Coma)
  58. Sex headaches
  59. Sexual dysfunction, female (See: Female sexual dysfunction)
  60. Sexual obsession (See: Compulsive sexual behavior)
  61. Sexually transmitted diseases
  62. Sexually transmitted diseases (See: Sexually transmitted diseases)
  63. Shaken baby syndrome
  64. Sheehan's syndrome
  65. Shellfish allergy
  66. Shigella infection
  67. Shin splints
  68. Shingles
  69. Short bowel syndrome
  70. Short stature (See: Dwarfism)
  71. Shoulder dislocation (See: Dislocated shoulder)
  72. Shoulder separation (See: Separated shoulder)
  73. Shy-Drager syndrome (See: Multiple system atrophy (MSA))
  74. Sick sinus syndrome
  75. Sickle cell anemia
  76. SIDS (See: Sudden infant death syndrome (SIDS))
  77. Sin Nombre virus infection (See: Hantavirus pulmonary syndrome)
  78. Sinus headache (See: Sinus headaches)
  79. Sinus headaches
  80. Sinusitis, acute (See: Acute sinusitis)
  81. Sinusitis, chronic (See: Chronic sinusitis)
  82. Sjogren's syndrome
  83. Skin cancer
  84. Skin cancer, melanoma (See: Melanoma)
  85. Skin, dry (See: Dry skin)
  86. Skin, itchy (See: Itchy skin (pruritus))
  87. Skipped heartbeats (See: Heart palpitations)
  88. Slapped cheek disease (See: Parvovirus infection)
  89. Sleep apnea
  90. Sleep apnea, central
  91. Sleep apnea, obstructive
  92. Sleep disorders
  93. Sleep terrors (See: Sleep terrors (night terrors))
  94. Sleep terrors (night terrors)
  95. Sleepiness, daytime (See: Narcolepsy)
  96. Sleeplessness (See: Insomnia)
  97. Sleep-related eating disorder
  98. Sleepwalking
  99. Slipped disk (See: Herniated disk)
  100. Slow heartbeat (See: Bradycardia)
  101. Small bowel cancer
  102. Small bowel prolapse (enterocele)
  103. Small vessel disease
  104. Smallpox
  105. Smoking (See: Nicotine dependence)
  106. Snoring
  107. Social anxiety disorder
  108. Social anxiety disorder (social phobia) (See: Social anxiety disorder)
  109. Sociopathic personality (See: Antisocial personality disorder)
  110. Soft palate cancer
  111. Soft tissue sarcoma
  112. Solar keratosis (See: Actinic keratosis)
  113. Solar lentigines (See: Age spots (liver spots))
  114. Solitary fibrous tumors
  115. Solitary rectal ulcer syndrome
  116. Somnambulism (See: Sleepwalking)
  117. Sore throat
  118. Soy allergy
  119. Spasmodic torticollis (See: Cervical dystonia)
  120. Specific reading disability (See: Dyslexia)
  121. Spermatocele
  122. Spider bites
  123. Spina bifida
  124. Spinal arteriovenous malformations
  125. Spinal cord injury
  126. Spinal curvature (See: Scoliosis)
  127. Spinal headaches
  128. Spinal stenosis
  129. Spinal tumor
  130. Splenomegaly (See: Enlarged spleen)
  131. Spondylitis (See: Ankylosing spondylitis)
  132. Spondylosis, cervical (See: Cervical spondylosis)
  133. Spontaneous coronary artery dissection
  134. Sprained ankle
  135. Sprains and strains
  136. Sprue, celiac (See: Celiac disease)
  137. Squamous cell carcinoma
  138. Stable angina (See: Angina)
  139. Stage 4 prostate cancer
  140. Stagnant syndrome (See: Blind loop syndrome)
  141. Stammering (See: Stuttering)
  142. Staph infections
  143. Statis syndrome (See: Blind loop syndrome)
  144. STDs (See: Sexually transmitted diseases)
  145. Steatosis (See: Nonalcoholic fatty liver disease)
  146. Steele-Richardson-Olszewski syndrome (See: Progressive supranuclear palsy)
  147. Stein-Leventhal syndrome (See: Polycystic ovary syndrome)
  148. Stenosing tenosynovitis (See: Trigger finger)
  149. Stenosis, aortic valve (See: Aortic valve stenosis)
  150. Stenosis, mitral valve (See: Mitral valve stenosis)
  151. Stenosis, pulmonary valve (See: Pulmonary valve stenosis)
  152. Stenosis, pyloric (See: Pyloric stenosis)
  153. Stenosis, spinal (See: Spinal stenosis)
  154. Stevens-Johnson syndrome
  155. Stickler syndrome
  156. Still's disease (See: Juvenile rheumatoid arthritis)
  157. Stings, bee (See: Bee stings)
  158. Stings, jellyfish (See: Jellyfish stings)
  159. Stings, scorpion (See: Scorpion stings)
  160. Stomach cancer
  161. Stomach flu (See: Viral gastroenteritis)
  162. Stomach pain, nonulcer (See: Nonulcer stomach pain)
  163. Stomach polyps
  164. Stomach ulcer (See: Peptic ulcer)
  165. Stomatodynia (See: Burning mouth syndrome)
  166. Stones, kidney (See: Kidney stones)
  167. Stool holding (See: Encopresis)
  168. Strains and sprains (See: Sprains and strains)
  169. Strep throat
  170. Stress cardiomyopathy (See: Broken heart syndrome)
  171. Stress fractures
  172. Stress incontinence
  173. Stretch marks
  174. Stroke
  175. Stump pain (See: Phantom pain)
  176. Stuttering
  177. Sty
  178. Subarachnoid hemorrhage
  179. Subconjunctival hemorrhage
  180. Subdural hematoma (See: Intracranial hematoma)
  181. Subfertility (See: Infertility)
  182. Sudden cardiac arrest
  183. Sudden infant death syndrome (SIDS)
  184. Suicide and suicidal thoughts
  185. Sun allergy
  186. Sun poisoning (See: Polymorphous light eruption)
  187. Sunburn: Soothing solutions
  188. Sunken chest (See: Pectus excavatum)
  189. Suspicious breast lumps
  190. Swallowing difficulties (See: Dysphagia)
  191. Sweating and body odor
  192. Sweating, excessive (See: Hyperhidrosis (excessive sweating))
  193. Sweet's syndrome
  194. Swimmer's ear
  195. Swimmer's itch
  196. Swine flu (H1N1 flu)
  197. Swollen lymph nodes
  198. Syncope, vasovagal (See: Vasovagal syncope)
  199. Syndrome X (See: Metabolic syndrome)
  200. Synostosis (See: Craniosynostosis)
  201. Syphilis
  202. Syringomyelia
  203. Systemic capillary leak syndrome
  204. Systemic mastocytosis
  205. Systemic sclerosis (See: Scleroderma)
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