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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. Shaken baby syndrome
  63. Sheehan's syndrome
  64. Shellfish allergy
  65. Shigella infection
  66. Shin splints
  67. Shingles
  68. Short bowel syndrome
  69. Short stature (See: Dwarfism)
  70. Shoulder dislocation (See: Dislocated shoulder)
  71. Shoulder separation (See: Separated shoulder)
  72. Shy-Drager syndrome (See: Multiple system atrophy (MSA))
  73. Sick sinus syndrome
  74. Sickle cell anemia
  75. SIDS (See: Sudden infant death syndrome (SIDS))
  76. Sin Nombre virus infection (See: Hantavirus pulmonary syndrome)
  77. Sinus headache (See: Sinus headaches)
  78. Sinus headaches
  79. Sinusitis, acute (See: Acute sinusitis)
  80. Sinusitis, chronic (See: Chronic sinusitis)
  81. Sjogren's syndrome
  82. Skin cancer
  83. Skin cancer, melanoma (See: Melanoma)
  84. Skin, dry (See: Dry skin)
  85. Skin, itchy (See: Itchy skin (pruritus))
  86. Skipped heartbeats (See: Heart palpitations)
  87. Slapped cheek disease (See: Parvovirus infection)
  88. Sleep apnea
  89. Sleep apnea, central
  90. Sleep apnea, obstructive
  91. Sleep disorders
  92. Sleep terrors (See: Sleep terrors (night terrors))
  93. Sleep terrors (night terrors)
  94. Sleepiness, daytime (See: Narcolepsy)
  95. Sleeplessness (See: Insomnia)
  96. Sleep-related eating disorder
  97. Sleepwalking
  98. Slipped disk (See: Herniated disk)
  99. Slow heartbeat (See: Bradycardia)
  100. Small bowel cancer
  101. Small bowel prolapse (enterocele)
  102. Small vessel disease
  103. Smallpox
  104. Smoking (See: Nicotine dependence)
  105. Snoring
  106. Social anxiety disorder
  107. Social anxiety disorder (social phobia) (See: Social anxiety disorder)
  108. Sociopathic personality (See: Antisocial personality disorder)
  109. Soft palate cancer
  110. Soft tissue sarcoma
  111. Solar keratosis (See: Actinic keratosis)
  112. Solar lentigines (See: Age spots (liver spots))
  113. Solitary fibrous tumors
  114. Solitary rectal ulcer syndrome
  115. Somnambulism (See: Sleepwalking)
  116. Sore throat
  117. Soy allergy
  118. Spasmodic torticollis (See: Cervical dystonia)
  119. Specific reading disability (See: Dyslexia)
  120. Spermatocele
  121. Spider bites
  122. Spina bifida
  123. Spinal arteriovenous malformations
  124. Spinal cord injury
  125. Spinal curvature (See: Scoliosis)
  126. Spinal headaches
  127. Spinal stenosis
  128. Spinal tumor
  129. Splenomegaly (See: Enlarged spleen)
  130. Spondylitis (See: Ankylosing spondylitis)
  131. Spondylosis, cervical (See: Cervical spondylosis)
  132. Spontaneous coronary artery dissection
  133. Sprained ankle
  134. Sprains and strains
  135. Sprue, celiac (See: Celiac disease)
  136. Squamous cell carcinoma
  137. Stable angina (See: Angina)
  138. Stage 4 prostate cancer
  139. Stagnant syndrome (See: Blind loop syndrome)
  140. Stammering (See: Stuttering)
  141. Staph infections
  142. Statis syndrome (See: Blind loop syndrome)
  143. STDs (See: Sexually transmitted diseases)
  144. Steatosis (See: Nonalcoholic fatty liver disease)
  145. Steele-Richardson-Olszewski syndrome (See: Progressive supranuclear palsy)
  146. Stein-Leventhal syndrome (See: Polycystic ovary syndrome (PCOS))
  147. Stenosing tenosynovitis (See: Trigger finger)
  148. Stenosis, aortic valve (See: Aortic valve stenosis)
  149. Stenosis, mitral valve (See: Mitral valve stenosis)
  150. Stenosis, pulmonary valve (See: Pulmonary valve stenosis)
  151. Stenosis, pyloric (See: Pyloric stenosis)
  152. Stenosis, spinal (See: Spinal stenosis)
  153. Stevens-Johnson syndrome
  154. Stickler syndrome
  155. Still's disease (See: Juvenile rheumatoid arthritis)
  156. Stings, bee (See: Bee stings)
  157. Stings, jellyfish (See: Jellyfish stings)
  158. Stings, scorpion (See: Scorpion stings)
  159. Stomach cancer
  160. Stomach flu (See: Viral gastroenteritis)
  161. Stomach pain, nonulcer (See: Nonulcer stomach pain)
  162. Stomach polyps
  163. Stomach ulcer (See: Peptic ulcer)
  164. Stomatodynia (See: Burning mouth syndrome)
  165. Stones, kidney (See: Kidney stones)
  166. Stool holding (See: Encopresis)
  167. Strains and sprains (See: Sprains and strains)
  168. Strep throat
  169. Stress cardiomyopathy (See: Broken heart syndrome)
  170. Stress fractures
  171. Stress incontinence
  172. Stretch marks
  173. Stroke
  174. Stump pain (See: Phantom pain)
  175. Stuttering
  176. Sty
  177. Subarachnoid hemorrhage
  178. Subconjunctival hemorrhage
  179. Subdural hematoma (See: Intracranial hematoma)
  180. Subfertility (See: Infertility)
  181. Sudden cardiac arrest
  182. Sudden infant death syndrome (SIDS)
  183. Suicide (See: Suicide and suicidal thoughts)
  184. Suicide and suicidal thoughts
  185. Suicide and suicidal thoughts (See: Suicide and suicidal thoughts)
  186. Sun allergy
  187. Sun poisoning (See: Polymorphous light eruption)
  188. Sunburn: Soothing solutions
  189. Sunken chest (See: Pectus excavatum)
  190. Suspicious breast lumps
  191. Swallowing difficulties (See: Dysphagia)
  192. Sweating and body odor
  193. Sweating, excessive (See: Hyperhidrosis (excessive sweating))
  194. Sweet's syndrome
  195. Swimmer's ear
  196. Swimmer's itch
  197. Swine flu (H1N1 flu)
  198. Swollen lymph nodes
  199. Syncope, vasovagal (See: Vasovagal syncope)
  200. Syndrome X (See: Metabolic syndrome)
  201. Synostosis (See: Craniosynostosis)
  202. Syphilis
  203. Syringomyelia
  204. Systemic capillary leak syndrome
  205. Systemic mastocytosis
  206. Systemic sclerosis (See: Scleroderma)
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