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. Central sleep apnea
  85. Cercarial dermatitis, also known asSwimmer's itch)
  86. Cerebral aneurysm, also known asBrain aneurysm)
  87. Cerebral palsy
  88. Cerumen impaction, also known asEarwax blockage)
  89. Cervical cancer
  90. Cervical dystonia
  91. Cervical osteoarthritis, also known asCervical spondylosis)
  92. Cervical spondylosis
  93. Cervicitis
  94. Chagas disease
  95. Charcot-Marie-Tooth disease
  96. CHD, also known asHip dysplasia)
  97. Chemical dependency, also known asDrug addiction (substance use disorder))
  98. Chemo brain
  99. Chest pain
  100. Chest wall pain, also known asCostochondritis)
  101. Chiari malformation
  102. Chickenpox
  103. Chilblains
  104. Child abuse
  105. Child maltreatment, also known asChild abuse)
  106. Childhood apraxia of speech
  107. Childhood asthma
  108. Childhood obesity
  109. Childhood schizophrenia
  110. Chlamydia trachomatis
  111. Cholangiocarcinoma (bile duct cancer)
  112. Cholangitis, primary sclerosing, also known asPrimary sclerosing cholangitis)
  113. Cholecystitis
  114. Cholera
  115. Cholestasis of pregnancy
  116. Cholesterol, high blood, also known asHigh cholesterol)
  117. Chondrosarcoma
  118. Chordoma
  119. Chorea, Huntington's, also known asHuntington's disease)
  120. Choroid plexus carcinoma
  121. Chronic adrenal insufficiency, also known asAddison's disease)
  122. Chronic cough
  123. Chronic daily headaches
  124. Chronic exertional compartment syndrome
  125. Chronic fatigue syndrome
  126. Chronic granulomatous disease
  127. Chronic hives
  128. Chronic kidney disease
  129. Chronic kidney failure, also known asChronic kidney disease)
  130. Chronic lymphocytic leukemia
  131. Chronic lymphocytic thyroiditis, also known asHashimoto's disease)
  132. Chronic myelogenous leukemia
  133. Chronic obstructive pulmonary disease, also known asCOPD)
  134. Chronic pelvic pain in women
  135. Chronic renal failure, also known asChronic kidney disease)
  136. Chronic sinusitis
  137. Chronic traumatic encephalopathy
  138. Chronic vulvar pain, also known asVulvodynia)
  139. Churg-Strauss syndrome
  140. Cirrhosis
  141. CJD, also known asCreutzfeldt-Jakob disease)
  142. CKD, also known asChronic kidney disease)
  143. Claudication
  144. Cleft lip and cleft palate
  145. Click-murmur syndrome, also known asMitral valve prolapse)
  146. Clinical depression, also known asDepression (major depressive disorder))
  147. CLL, also known asChronic lymphocytic leukemia)
  148. Clostridioides difficile infection, also known asC. difficile infection)
  149. Clostridium difficile infection, also known asC. difficile infection)
  150. Clubfoot
  151. Cluster headache
  152. Coarctation of the aorta
  153. Coccidioidomycosis, also known asValley fever)
  154. Cold allergy, also known asCold urticaria)
  155. Cold exposure, also known asHypothermia)
  156. Cold sore
  157. Cold urticaria
  158. Cold, common, also known asCommon cold)
  159. Colic
  160. Colitis, ischemic, also known asIschemic colitis)
  161. Colitis, microscopic, also known asMicroscopic colitis)
  162. Colitis, pseudomembranous, also known asPseudomembranous colitis)
  163. Colitis, ulcerative, also known asUlcerative colitis)
  164. Collapsed lung, also known asAtelectasis)
  165. Collapsed lung, also known asPneumothorax)
  166. Colon cancer
  167. Colon polyps
  168. Colonic ischemia, also known asIschemic colitis)
  169. Color blindness
  170. Colorectal cancer, also known asColon cancer)
  171. Coma
  172. Common cold
  173. Common cold in babies
  174. Common variable immunodeficiency
  175. Common variable immunodeficiency , also known asCommon variable immunodeficiency)
  176. Common warts
  177. Compartment syndrome, chronic exertional, also known asChronic exertional compartment syndrome)
  178. Complex regional pain syndrome
  179. Complicated bereavement, also known asComplicated grief)
  180. Complicated grief
  181. Compulsive gambling
  182. Compulsive hoarding syndrome, also known asHoarding disorder)
  183. Compulsive overeating, also known asBinge-eating disorder)
  184. Compulsive sexual behavior
  185. Compulsive stealing, also known asKleptomania)
  186. Concussion
  187. Condylomata acuminata, also known asGenital warts)
  188. Congenital adrenal hyperplasia
  189. Congenital heart defects in children
  190. Congenital heart disease in adults
  191. Congenital hip dislocation, also known asHip dysplasia)
  192. Congenital megacolon, also known asHirschsprung's disease)
  193. Congenital mitral valve anomalies
  194. Congenital myasthenic syndromes
  195. Congenital myopathies
  196. Congestive heart failure, also known asHeart failure)
  197. Conjoined twins
  198. Conjunctivitis, also known asPink eye (conjunctivitis))
  199. Conn's syndrome, also known asPrimary aldosteronism)
  200. Constipation
  201. Constipation in children
  202. Contact dermatitis
  203. Convergence insufficiency
  204. Cooley's anemia, also known asThalassemia)
  205. COPD
  206. Corns and calluses
  207. Corona virus, also known asCoronavirus disease 2019 (COVID-19))
  208. Coronary artery disease
  209. Coronary microvascular disease, also known asSmall vessel disease)
  210. Coronavirus disease 2019 (COVID-19)
  211. Corticobasal degeneration
  212. Costochondritis
  213. Costosternal chondrodynia, also known asCostochondritis)
  214. Costosternal syndrome, also known asCostochondritis)
  215. Cough headaches
  216. Cough, chronic, also known asChronic cough)
  217. COVID-19, also known asCoronavirus disease 2019 (COVID-19))
  218. COVID-19-associated multisystem inflammatory syndrome in children, also known asMultisystem inflammatory syndrome in children (MIS-C))
  219. Crabs, also known asPubic lice (crabs))
  220. Cradle cap
  221. Cramp, muscle, also known asMuscle cramp)
  222. Cramps, menstrual, also known asMenstrual cramps)
  223. Cranial arteritis, also known asGiant cell arteritis)
  224. Craniopharyngioma
  225. Craniosynostosis
  226. Creutzfeldt-Jakob disease
  227. Crib death, also known asSudden infant death syndrome (SIDS))
  228. Crohn's disease
  229. Croup
  230. CRPS, also known asComplex regional pain syndrome)
  231. Cryoglobulinemia
  232. Cryptorchidism, also known asUndescended testicle)
  233. Cryptosporidiosis, also known asCryptosporidium infection)
  234. Cryptosporidium infection
  235. CTCL, also known asCutaneous T-cell lymphoma)
  236. Curvature of the penis, also known asPeyronie's disease)
  237. Curvature of the spine, also known asScoliosis)
  238. Cushing syndrome
  239. Cutaneous B-cell lymphoma
  240. Cutaneous T-cell lymphoma
  241. Cutting/self-injury, also known asSelf-injury/cutting)
  242. Cyclic vomiting syndrome
  243. Cyclospora infection
  244. Cyclothymia (cyclothymic disorder)
  245. Cyclothymic disorder, also known asCyclothymia (cyclothymic disorder))
  246. Cyst, Bartholin's, also known asBartholin's cyst)
  247. Cyst, ganglion, also known asGanglion cyst)
  248. Cyst, kidney, also known asKidney cysts)
  249. Cyst, ovarian, also known asOvarian cysts)
  250. Cyst, pancreatic, also known asPancreatic cysts)
  251. Cyst, pilonidal, also known asPilonidal cyst)
  252. Cyst, spermatic, also known asSpermatocele)
  253. Cystic fibrosis
  254. Cystitis
  255. Cystitis, interstitial, also known asInterstitial cystitis)
  256. Cysts, epidermoid, also known asEpidermoid cysts)
  257. Cysts, sebaceous, also known asEpidermoid cysts)
  258. Cytomegalovirus (CMV) infection
  259. Cytomegalovirus infection, also known asCytomegalovirus (CMV) infection)
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