1. C. difficile colitis, also known asPseudomembranous colitis)
  2. C. difficile infection
  3. Calciphylaxis
  4. Calluses and corns, also known asCorns and calluses)
  5. Cancer
  6. Cancer, acute lymphocytic leukemia, also known asAcute lymphocytic leukemia)
  7. Cancer, acute myelogenous leukemia, also known asAcute myelogenous leukemia)
  8. Cancer, anal, also known asAnal cancer)
  9. Cancer, basal cell, also known asBasal cell carcinoma)
  10. Cancer, bladder, also known asBladder cancer)
  11. Cancer, bone, also known asBone cancer)
  12. Cancer, breast, also known asBreast cancer)
  13. Cancer, carcinoid tumors, also known asCarcinoid tumors)
  14. Cancer, cervical, also known asCervical cancer)
  15. Cancer, chronic lymphocytic leukemia, also known asChronic lymphocytic leukemia)
  16. Cancer, chronic myelogenous leukemia, also known asChronic myelogenous leukemia)
  17. Cancer, colon, also known asColon cancer)
  18. Cancer, endometrial, also known asEndometrial cancer)
  19. Cancer, esophageal, also known asEsophageal cancer)
  20. Cancer, eye melanoma, also known asEye melanoma)
  21. Cancer, gallbladder, also known asGallbladder cancer)
  22. Cancer, gastric, also known asStomach cancer)
  23. Cancer, hairy cell leukemia, also known asHairy cell leukemia)
  24. Cancer, Hodgkin's disease, also known asHodgkin's lymphoma (Hodgkin's disease))
  25. Cancer, Hurthle cell, also known asHurthle cell cancer)
  26. Cancer, inflammatory breast, also known asInflammatory breast cancer)
  27. Cancer, kidney, also known asKidney cancer)
  28. Cancer, leukemia, also known asLeukemia)
  29. Cancer, lip, also known asMouth cancer)
  30. Cancer, liver, also known asLiver cancer)
  31. Cancer, lung, also known asLung cancer)
  32. Cancer, male breast, also known asMale breast cancer)
  33. Cancer, Merkel cell, also known asMerkel cell carcinoma)
  34. Cancer, mesothelioma, also known asMesothelioma)
  35. Cancer, mouth, also known asMouth cancer)
  36. Cancer, multiple myeloma, also known asMultiple myeloma)
  37. Cancer, nasopharyngeal, also known asNasopharyngeal carcinoma)
  38. Cancer, neuroblastoma, also known asNeuroblastoma)
  39. Cancer, non-Hodgkin's lymphoma, also known asNon-Hodgkin's lymphoma)
  40. Cancer, oral, also known asMouth cancer)
  41. Cancer, ovarian, also known asOvarian cancer)
  42. Cancer, pancreatic, also known asPancreatic cancer)
  43. Cancer, paraneoplastic syndromes, also known asParaneoplastic syndromes of the nervous system)
  44. Cancer, prostate, also known asProstate cancer)
  45. Cancer, rectal, also known asRectal cancer)
  46. Cancer, retinoblastoma, also known asRetinoblastoma)
  47. Cancer, skin, also known asSkin cancer)
  48. Cancer, soft tissue sarcoma, also known asSoft tissue sarcoma)
  49. Cancer, squamous cell, also known asSquamous cell carcinoma of the skin)
  50. Cancer, stomach, also known asStomach cancer)
  51. Cancer, testicular, also known asTesticular cancer)
  52. Cancer, throat, also known asThroat cancer)
  53. Cancer, thyroid, also known asThyroid cancer)
  54. Cancer, uterine, also known asEndometrial cancer)
  55. Cancer, vagina, also known asVaginal cancer)
  56. Cancer, vulvar, also known asVulvar cancer)
  57. Cancer, Wilms' tumor, also known asWilms' tumor)
  58. Candidiasis, oral, also known asOral thrush)
  59. Candidiasis, vaginal, also known asYeast infection (vaginal))
  60. Canker sore
  61. Carbon monoxide poisoning
  62. Carbuncles and boils, also known asBoils and carbuncles)
  63. Carcinoid syndrome
  64. Carcinoid tumors
  65. Carcinoma of unknown primary
  66. Cardiac arrest, sudden, also known asSudden cardiac arrest)
  67. Cardiac ischemia, also known asMyocardial ischemia)
  68. Cardiogenic shock
  69. Cardiomegaly, also known asEnlarged heart)
  70. Cardiomyopathy
  71. Cardiomyopathy, dilated, also known asDilated cardiomyopathy)
  72. Cardiomyopathy, hypertrophic, also known asHypertrophic cardiomyopathy)
  73. Cardiovascular disease, also known asHeart disease)
  74. Carotid artery disease
  75. Carpal tunnel syndrome
  76. Castleman disease
  77. Cataracts
  78. Cavernous malformations
  79. Cavities/tooth decay
  80. Celiac disease
  81. Cellulite
  82. Cellulitis
  83. Central nervous system vascular malformations
  84. Cercarial dermatitis, also known asSwimmer's itch)
  85. Cerebral aneurysm, also known asBrain aneurysm)
  86. Cerebral palsy
  87. Cerumen impaction, also known asEarwax blockage)
  88. Cervical cancer
  89. Cervical dystonia
  90. Cervical osteoarthritis, also known asCervical spondylosis)
  91. Cervical spondylosis
  92. Cervicitis
  93. Chagas disease
  94. Charcot-Marie-Tooth disease
  95. CHD, also known asHip dysplasia)
  96. Chemical dependency, also known asDrug addiction (substance use disorder))
  97. Chemo brain
  98. Chest pain
  99. Chest wall pain, also known asCostochondritis)
  100. Chiari malformation
  101. Chickenpox
  102. Chilblains
  103. Child abuse
  104. Child maltreatment, also known asChild abuse)
  105. Childhood apraxia of speech
  106. Childhood asthma
  107. Childhood obesity
  108. Childhood schizophrenia
  109. Chlamydia trachomatis
  110. Cholangiocarcinoma (bile duct cancer)
  111. Cholangitis, primary sclerosing, also known asPrimary sclerosing cholangitis)
  112. Cholecystitis
  113. Cholera
  114. Cholestasis of pregnancy
  115. Cholesterol, high blood, also known asHigh cholesterol)
  116. Chondrosarcoma
  117. Chordoma
  118. Chorea, Huntington's, also known asHuntington's disease)
  119. Choroid plexus carcinoma
  120. Chronic adrenal insufficiency, also known asAddison's disease)
  121. Chronic cough
  122. Chronic daily headaches
  123. Chronic exertional compartment syndrome
  124. Chronic fatigue syndrome
  125. Chronic granulomatous disease
  126. Chronic hives
  127. Chronic kidney disease
  128. Chronic kidney failure, also known asChronic kidney disease)
  129. Chronic lymphocytic leukemia
  130. Chronic lymphocytic thyroiditis, also known asHashimoto's disease)
  131. Chronic myelogenous leukemia
  132. Chronic obstructive pulmonary disease, also known asCOPD)
  133. Chronic pelvic pain in women
  134. Chronic renal failure, also known asChronic kidney disease)
  135. Chronic sinusitis
  136. Chronic traumatic encephalopathy
  137. Chronic vulvar pain, also known asVulvodynia)
  138. Churg-Strauss syndrome
  139. Cirrhosis
  140. CJD, also known asCreutzfeldt-Jakob disease)
  141. CKD, also known asChronic kidney disease)
  142. Claudication
  143. Cleft lip and cleft palate
  144. Click-murmur syndrome, also known asMitral valve prolapse)
  145. Clinical depression, also known asDepression (major depressive disorder))
  146. CLL, also known asChronic lymphocytic leukemia)
  147. Clubfoot
  148. Cluster headache
  149. Coarctation of the aorta
  150. Coccidioidomycosis, also known asValley fever)
  151. Cold allergy, also known asCold urticaria)
  152. Cold exposure, also known asHypothermia)
  153. Cold sore
  154. Cold urticaria
  155. Cold, common, also known asCommon cold)
  156. Colic
  157. Colitis, ischemic, also known asIschemic colitis)
  158. Colitis, microscopic, also known asMicroscopic colitis)
  159. Colitis, pseudomembranous, also known asPseudomembranous colitis)
  160. Colitis, ulcerative, also known asUlcerative colitis)
  161. Collapsed lung, also known asPneumothorax)
  162. Collapsed lung, also known asAtelectasis)
  163. Colon cancer
  164. Colon polyps
  165. Colonic ischemia, also known asIschemic colitis)
  166. Color blindness
  167. Colorectal cancer, also known asColon cancer)
  168. Coma
  169. Common cold
  170. Common cold in babies
  171. Common variable immunodeficiency
  172. Common variable immunodeficiency , also known asCommon variable immunodeficiency)
  173. Common warts
  174. Compartment syndrome, chronic exertional, also known asChronic exertional compartment syndrome)
  175. Complex regional pain syndrome
  176. Complicated bereavement, also known asComplicated grief)
  177. Complicated grief
  178. Compulsive gambling
  179. Compulsive hoarding syndrome, also known asHoarding disorder)
  180. Compulsive overeating, also known asBinge-eating disorder)
  181. Compulsive sexual behavior
  182. Compulsive stealing, also known asKleptomania)
  183. Concussion
  184. Condylomata acuminata, also known asGenital warts)
  185. Congenital adrenal hyperplasia
  186. Congenital heart defects in children
  187. Congenital heart disease in adults
  188. Congenital hip dislocation, also known asHip dysplasia)
  189. Congenital megacolon, also known asHirschsprung's disease)
  190. Congenital mitral valve anomalies
  191. Congenital myasthenic syndromes
  192. Congenital myopathies
  193. Congestive heart failure, also known asHeart failure)
  194. Conjoined twins
  195. Conjunctivitis, also known asPink eye (conjunctivitis))
  196. Conn's syndrome, also known asPrimary aldosteronism)
  197. Constipation
  198. Constipation in children
  199. Contact dermatitis
  200. Convergence insufficiency
  201. Cooley's anemia, also known asThalassemia)
  202. COPD
  203. Corns and calluses
  204. Corona virus, also known asCoronavirus disease 2019 (COVID-19))
  205. Coronary artery disease
  206. Coronary microvascular disease, also known asSmall vessel disease)
  207. Coronavirus disease 2019 (COVID-19)
  208. Corticobasal degeneration
  209. Costochondritis
  210. Costosternal chondrodynia, also known asCostochondritis)
  211. Costosternal syndrome, also known asCostochondritis)
  212. Cough headaches
  213. Cough, chronic, also known asChronic cough)
  214. COVID-19, also known asCoronavirus disease 2019 (COVID-19))
  215. Crabs, also known asPubic lice (crabs))
  216. Cradle cap
  217. Cramp, muscle, also known asMuscle cramp)
  218. Cramps, menstrual, also known asMenstrual cramps)
  219. Cranial arteritis, also known asGiant cell arteritis)
  220. Craniopharyngioma
  221. Craniosynostosis
  222. Creutzfeldt-Jakob disease
  223. Crib death, also known asSudden infant death syndrome (SIDS))
  224. Crohn's disease
  225. Croup
  226. CRPS, also known asComplex regional pain syndrome)
  227. Cryoglobulinemia
  228. Cryptorchidism, also known asUndescended testicle)
  229. Cryptosporidiosis, also known asCryptosporidium infection)
  230. Cryptosporidium infection
  231. CTCL, also known asCutaneous T-cell lymphoma)
  232. Curvature of the penis, also known asPeyronie's disease)
  233. Curvature of the spine, also known asScoliosis)
  234. Cushing syndrome
  235. Cutaneous B-cell lymphoma
  236. Cutaneous T-cell lymphoma
  237. Cutting/self-injury, also known asSelf-injury/cutting)
  238. Cyclic vomiting syndrome
  239. Cyclospora infection
  240. Cyclothymia (cyclothymic disorder)
  241. Cyclothymic disorder, also known asCyclothymia (cyclothymic disorder))
  242. Cyst, Bartholin's, also known asBartholin's cyst)
  243. Cyst, ganglion, also known asGanglion cyst)
  244. Cyst, kidney, also known asKidney cysts)
  245. Cyst, ovarian, also known asOvarian cysts)
  246. Cyst, pancreatic, also known asPancreatic cysts)
  247. Cyst, pilonidal, also known asPilonidal cyst)
  248. Cyst, spermatic, also known asSpermatocele)
  249. Cystic fibrosis
  250. Cystitis
  251. Cystitis, interstitial, also known asInterstitial cystitis)
  252. Cysts, epidermoid, also known asEpidermoid cysts)
  253. Cysts, sebaceous, also known asEpidermoid cysts)
  254. Cytomegalovirus (CMV) infection
  255. Cytomegalovirus infection, also known asCytomegalovirus (CMV) infection)
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