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  1. C. difficile
  2. C. difficile colitis (See: Pseudomembranous colitis)
  3. Calciphylaxis
  4. Calluses and corns (See: Corns and calluses)
  5. Cancer
  6. Cancer of the ureter
  7. Cancer, acute lymphocytic leukemia (See: Acute lymphocytic leukemia)
  8. Cancer, acute myelogenous leukemia (See: Acute myelogenous leukemia (AML))
  9. Cancer, anal (See: Anal cancer)
  10. Cancer, basal cell (See: Basal cell carcinoma)
  11. Cancer, bile duct (See: Gallbladder cancer)
  12. Cancer, bladder (See: Bladder cancer)
  13. Cancer, bone (See: Bone cancer)
  14. Cancer, breast (See: Breast cancer)
  15. Cancer, carcinoid tumors (See: Carcinoid tumors)
  16. Cancer, cervical (See: Cervical cancer)
  17. Cancer, chronic lymphocytic leukemia (See: Chronic lymphocytic leukemia)
  18. Cancer, chronic myelogenous leukemia (See: Chronic myelogenous leukemia)
  19. Cancer, colon (See: Colon cancer)
  20. Cancer, endometrial (See: Endometrial cancer)
  21. Cancer, esophageal (See: Esophageal cancer)
  22. Cancer, eye melanoma (See: Eye melanoma)
  23. Cancer, gallbladder (See: Gallbladder cancer)
  24. Cancer, gastric (See: Stomach cancer)
  25. Cancer, hairy cell leukemia (See: Hairy cell leukemia)
  26. Cancer, Hodgkin's disease (See: Hodgkin's lymphoma)
  27. Cancer, Hurthle cell (See: Hurthle cell cancer)
  28. Cancer, hypopharyngeal (See: Throat cancer)
  29. Cancer, inflammatory breast (See: Inflammatory breast cancer)
  30. Cancer, kidney (See: Kidney cancer)
  31. Cancer, laryngeal (See: Throat cancer)
  32. Cancer, leukemia (See: Leukemia)
  33. Cancer, lip (See: Mouth cancer)
  34. Cancer, liver (See: Liver cancer)
  35. Cancer, lung (See: Lung cancer)
  36. Cancer, male breast (See: Male breast cancer)
  37. Cancer, Merkel cell (See: Merkel cell carcinoma)
  38. Cancer, mesothelioma (See: Mesothelioma)
  39. Cancer, mouth (See: Mouth cancer)
  40. Cancer, multiple myeloma (See: Multiple myeloma)
  41. Cancer, nasopharyngeal (See: Nasopharyngeal carcinoma)
  42. Cancer, neuroblastoma (See: Neuroblastoma)
  43. Cancer, non-Hodgkin's lymphoma (See: Non-Hodgkin's lymphoma)
  44. Cancer, oral (See: Mouth cancer)
  45. Cancer, oropharyngeal (See: Throat cancer)
  46. Cancer, ovarian (See: Ovarian cancer)
  47. Cancer, pancreatic (See: Pancreatic cancer)
  48. Cancer, paraneoplastic syndromes (See: Paraneoplastic syndromes of the nervous system)
  49. Cancer, pharyngeal (See: Throat cancer)
  50. Cancer, prostate (See: Prostate cancer)
  51. Cancer, rectal (See: Rectal cancer)
  52. Cancer, retinoblastoma (See: Retinoblastoma)
  53. Cancer, salivary gland (See: Salivary gland cancer)
  54. Cancer, skin (See: Skin cancer)
  55. Cancer, soft tissue sarcoma (See: Soft tissue sarcoma)
  56. Cancer, squamous cell (See: Squamous cell carcinoma of the skin)
  57. Cancer, stomach (See: Stomach cancer)
  58. Cancer, testicular (See: Testicular cancer)
  59. Cancer, throat (See: Throat cancer)
  60. Cancer, thyroid (See: Thyroid cancer)
  61. Cancer, uterine (See: Endometrial cancer)
  62. Cancer, vagina (See: Vaginal cancer)
  63. Cancer, vulvar (See: Vulvar cancer)
  64. Cancer, Wilms' tumor (See: Wilms' tumor)
  65. Candidiasis, oral (See: Oral thrush)
  66. Canker sore
  67. Carbon monoxide poisoning
  68. Carbuncles and boils (See: Boils and carbuncles)
  69. Carcinoid syndrome
  70. Carcinoid tumors
  71. Carcinoma of unknown primary
  72. Cardiac arrest, sudden (See: Sudden cardiac arrest)
  73. Cardiac ischemia (See: Myocardial ischemia)
  74. Cardiogenic shock
  75. Cardiomegaly (See: Enlarged heart)
  76. Cardiomyopathy
  77. Cardiomyopathy, dilated (See: Dilated cardiomyopathy)
  78. Cardiomyopathy, hypertrophic (See: Hypertrophic cardiomyopathy)
  79. Cardiovascular disease (See: Heart disease)
  80. Carotid artery disease
  81. Carpal tunnel syndrome
  82. Castleman disease
  83. Cataracts
  84. Causalgia (See: Complex regional pain syndrome)
  85. Cavernous malformations
  86. Cavities/tooth decay
  87. Celiac disease
  88. Cellulite
  89. Cellulitis
  90. Central nervous system vascular malformations
  91. Cercarial dermatitis (See: Swimmer's itch)
  92. Cerebral arteriovenous malformation (See: Arteriovenous malformation)
  93. Cerebral palsy
  94. Cerumen impaction (See: Earwax blockage)
  95. Cervical cancer
  96. Cervical dystonia
  97. Cervical osteoarthritis (See: Cervical spondylosis)
  98. Cervical spondylosis
  99. Cervicitis
  100. Chagas disease
  101. Charcot-Marie-Tooth disease
  102. CHD (See: Hip dysplasia)
  103. Chemical dependency (See: Drug addiction)
  104. Chemo brain
  105. Chest pain
  106. Chest wall pain (See: Costochondritis)
  107. Chiari malformation
  108. Chickenpox
  109. Chilblains
  110. Child abuse
  111. Child maltreatment (See: Child abuse)
  112. Childhood apraxia of speech
  113. Childhood asthma
  114. Childhood disintegrative disorder
  115. Childhood obesity
  116. Childhood schizophrenia
  117. Chlamydia
  118. Cholangiocarcinoma (See: Gallbladder cancer)
  119. Cholangitis, primary sclerosing (See: Primary sclerosing cholangitis)
  120. Cholecystitis
  121. Cholera
  122. Cholestasis of pregnancy
  123. Cholesterol, high blood (See: High cholesterol)
  124. Chondromalacia patella
  125. Chondrosarcoma
  126. Chordoma
  127. Chorea, Huntington's (See: Huntington's disease)
  128. Chronic adrenal insufficiency (See: Addison's disease)
  129. Chronic constipation
  130. Chronic cough
  131. Chronic daily headaches
  132. Chronic exertional compartment syndrome
  133. Chronic fatigue syndrome
  134. Chronic fatigue syndrome (See: Chronic fatigue syndrome)
  135. Chronic granulomatous disease
  136. Chronic hives (urticaria)
  137. Chronic kidney disease
  138. Chronic kidney disease (See: Chronic kidney disease)
  139. Chronic kidney failure (See: Chronic kidney disease)
  140. Chronic lymphocytic leukemia
  141. Chronic lymphocytic thyroiditis (See: Hashimoto's disease)
  142. Chronic myelogenous leukemia
  143. Chronic obstructive pulmonary disease (See: COPD)
  144. Chronic pelvic pain in women
  145. Chronic sinusitis
  146. Chronic traumatic encephalopathy
  147. Chronic vulvar pain (See: Vulvodynia)
  148. Churg-Strauss syndrome
  149. Cirrhosis
  150. Cirrhosis, primary biliary (See: Primary biliary cirrhosis)
  151. CJD (See: Creutzfeldt-Jakob disease)
  152. CKD (See: Chronic kidney disease)
  153. Claudication
  154. Cleft lip and cleft palate
  155. Click-murmur syndrome (See: Mitral valve prolapse)
  156. Clinical depression (See: Depression)
  157. Clubfoot
  158. Cluster headache
  159. Coarctation of the aorta
  160. Coccidioidomycosis (See: Valley fever)
  161. Cold allergy (See: Cold urticaria)
  162. Cold exposure (See: Hypothermia)
  163. Cold sore
  164. Cold urticaria
  165. Cold, common (See: Common cold)
  166. Colic
  167. Colitis, collagenous (See: Microscopic colitis)
  168. Colitis, ischemic (See: Ischemic colitis)
  169. Colitis, lymphocytic (See: Microscopic colitis)
  170. Colitis, microscopic (See: Microscopic colitis)
  171. Colitis, pseudomembranous (See: Pseudomembranous colitis)
  172. Colitis, ulcerative (See: Ulcerative colitis)
  173. Collagenous colitis (See: Microscopic colitis)
  174. Collapsed lung (See: Pneumothorax)
  175. Colon cancer
  176. Colon polyps
  177. Colonic ischemia (See: Ischemic colitis)
  178. Colorblindness (See: Poor color vision)
  179. Colorectal cancer (See: Colon cancer)
  180. Coma
  181. Common cold
  182. Common cold in babies
  183. Common variable immunodeficiency
  184. Common warts
  185. Compartment syndrome, chronic exertional (See: Chronic exertional compartment syndrome)
  186. Complex regional pain syndrome
  187. Complicated bereavement (See: Complicated grief)
  188. Complicated grief
  189. Compulsive gambling
  190. Compulsive hoarding syndrome (See: Hoarding disorder)
  191. Compulsive overeating (See: Binge-eating disorder)
  192. Compulsive sexual behavior
  193. Compulsive stealing (See: Kleptomania)
  194. Concussion
  195. Condylomata acuminata (See: Genital warts)
  196. Congenital adrenal hyperplasia
  197. Congenital heart defects in children
  198. Congenital heart disease in adults
  199. Congenital hip dislocation (See: Hip dysplasia)
  200. Congenital megacolon (See: Hirschsprung's disease)
  201. Congenital myasthenic syndromes
  202. Congenital myopathies
  203. Congestive heart failure (See: Heart failure)
  204. Conjoined twins
  205. Conjunctivitis (See: Pink eye (conjunctivitis))
  206. Conn's syndrome (See: Primary aldosteronism)
  207. Constipation in children
  208. Contact dermatitis
  209. Convergence insufficiency
  210. Conversion disorder
  211. Cooley's anemia (See: Thalassemia)
  212. COPD
  213. Corns and calluses
  214. Coronary artery disease
  215. Corticobasal degeneration
  216. Costochondritis
  217. Costosternal chondrodynia (See: Costochondritis)
  218. Costosternal syndrome (See: Costochondritis)
  219. Cough headaches
  220. Cough, chronic (See: Chronic cough)
  221. Coxsackievirus infection (See: Hand-foot-and-mouth disease)
  222. Crabs (See: Pubic lice (crabs))
  223. Cradle cap
  224. Cramp, muscle (See: Muscle cramp)
  225. Cramps, menstrual (See: Menstrual cramps)
  226. Cranial arteritis (See: Giant cell arteritis)
  227. Craniopharyngioma
  228. Craniosynostosis
  229. Creutzfeldt-Jakob disease
  230. Crib death (See: Sudden infant death syndrome (SIDS))
  231. Crohn's disease
  232. Croup
  233. Cryoglobulinemia
  234. Cryptorchidism (See: Undescended testicle)
  235. Cryptosporidiosis (See: Cryptosporidium infection)
  236. Cryptosporidium infection
  237. Curvature of the penis (See: Peyronie's disease)
  238. Curvature of the spine (See: Scoliosis)
  239. Cushing syndrome
  240. Cutaneous T-cell lymphoma
  241. Cyclic vomiting syndrome
  242. Cyclospora infection
  243. Cyclothymia
  244. Cyclothymic disorder (See: Cyclothymia)
  245. Cyst, Bartholin's (See: Bartholin's cyst)
  246. Cyst, ganglion (See: Ganglion cyst)
  247. Cyst, kidney (See: Kidney cysts)
  248. Cyst, ovarian (See: Ovarian cysts)
  249. Cyst, pancreatic (See: Pancreatic cysts)
  250. Cyst, pilonidal (See: Pilonidal cyst)
  251. Cyst, spermatic (See: Spermatocele)
  252. Cystic fibrosis
  253. Cystitis
  254. Cystitis, interstitial (See: Interstitial cystitis)
  255. Cysts, epidermoid (See: Epidermoid (sebaceous) cysts)
  256. Cysts, sebaceous (See: Epidermoid (sebaceous) cysts)
  257. Cytomegalovirus (CMV) infection
  258. Cytomegalovirus infection (See: Cytomegalovirus (CMV) infection)
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