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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 (SCAD))
  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. Somatic symptom disorder
  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 cord tumor
  127. Spinal curvature (See: Scoliosis)
  128. Spinal headaches
  129. Spinal stenosis
  130. Splenomegaly (See: Enlarged spleen)
  131. Spondylitis (See: Ankylosing spondylitis)
  132. Spondylosis, cervical (See: Cervical spondylosis)
  133. Spontaneous coronary artery dissection (SCAD)
  134. Sprained ankle
  135. Sprains and strains
  136. Sprue, celiac (See: Celiac disease)
  137. Squamous cell carcinoma of the skin
  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 (PCOS))
  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 (See: Suicide and suicidal thoughts)
  185. Suicide and suicidal thoughts
  186. Suicide and suicidal thoughts (See: Suicide and suicidal thoughts)
  187. Sun allergy
  188. Sun poisoning (See: Polymorphous light eruption)
  189. Sunburn: Soothing solutions
  190. Sunken chest (See: Pectus excavatum)
  191. Suspicious breast lumps
  192. Swallowing difficulties (See: Dysphagia)
  193. Sweating and body odor
  194. Sweating, excessive (See: Hyperhidrosis)
  195. Sweet's syndrome
  196. Swimmer's ear
  197. Swimmer's itch
  198. Swine flu (H1N1 flu)
  199. Swollen knee
  200. Swollen lymph nodes
  201. Syncope, vasovagal (See: Vasovagal syncope)
  202. Syndrome X (See: Metabolic syndrome)
  203. Synostosis (See: Craniosynostosis)
  204. Syphilis
  205. Syringomyelia
  206. Systemic capillary leak syndrome
  207. Systemic mastocytosis
  208. Systemic sclerosis (See: Scleroderma)
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