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