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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. Chemical dependency (See: Drug addiction)
  103. Chemo brain
  104. Chest pain
  105. Chest wall pain (See: Costochondritis)
  106. Chiari malformation
  107. Chickenpox
  108. Chilblains
  109. Child abuse
  110. Childhood apraxia of speech
  111. Childhood asthma
  112. Childhood disintegrative disorder
  113. Childhood obesity
  114. Childhood schizophrenia
  115. Chlamydia
  116. Cholangiocarcinoma (See: Gallbladder cancer)
  117. Cholangitis, primary sclerosing (See: Primary sclerosing cholangitis)
  118. Cholecystitis
  119. Cholera
  120. Cholestasis of pregnancy
  121. Cholesterol, high blood (See: High cholesterol)
  122. Chondromalacia patella
  123. Chondrosarcoma
  124. Chordoma
  125. Chorea, Huntington's (See: Huntington's disease)
  126. Chronic adrenal insufficiency (See: Addison's disease)
  127. Chronic constipation
  128. Chronic cough
  129. Chronic daily headaches
  130. Chronic exertional compartment syndrome
  131. Chronic fatigue syndrome
  132. Chronic fatigue syndrome (See: Chronic fatigue syndrome)
  133. Chronic granulomatous disease
  134. Chronic hives (urticaria)
  135. Chronic kidney disease
  136. Chronic kidney disease (See: Chronic kidney disease)
  137. Chronic kidney failure (See: Chronic kidney disease)
  138. Chronic lymphocytic leukemia
  139. Chronic lymphocytic thyroiditis (See: Hashimoto's disease)
  140. Chronic myelogenous leukemia
  141. Chronic obstructive pulmonary disease (See: COPD)
  142. Chronic pelvic pain in women
  143. Chronic sinusitis
  144. Chronic traumatic encephalopathy
  145. Chronic vulvar pain (See: Vulvodynia)
  146. Churg-Strauss syndrome
  147. Cirrhosis
  148. Cirrhosis, primary biliary (See: Primary biliary cirrhosis)
  149. CJD (See: Creutzfeldt-Jakob disease)
  150. CKD (See: Chronic kidney disease)
  151. Claudication
  152. Cleft lip and cleft palate
  153. Click-murmur syndrome (See: Mitral valve prolapse)
  154. Clinical depression (See: Depression)
  155. Clubfoot
  156. Cluster headache
  157. Coarctation of the aorta
  158. Coccidioidomycosis (See: Valley fever)
  159. Cold allergy (See: Cold urticaria)
  160. Cold exposure (See: Hypothermia)
  161. Cold sore
  162. Cold urticaria
  163. Cold, common (See: Common cold)
  164. Colic
  165. Colitis, collagenous (See: Microscopic colitis)
  166. Colitis, ischemic (See: Ischemic colitis)
  167. Colitis, lymphocytic (See: Microscopic colitis)
  168. Colitis, microscopic (See: Microscopic colitis)
  169. Colitis, pseudomembranous (See: Pseudomembranous colitis)
  170. Colitis, ulcerative (See: Ulcerative colitis)
  171. Collagenous colitis (See: Microscopic colitis)
  172. Collapsed lung (See: Pneumothorax)
  173. Colon cancer
  174. Colon polyps
  175. Colonic ischemia (See: Ischemic colitis)
  176. Colorblindness (See: Poor color vision)
  177. Colorectal cancer (See: Colon cancer)
  178. Coma
  179. Common cold
  180. Common cold in babies
  181. Common variable immunodeficiency
  182. Common warts
  183. Compartment syndrome, chronic exertional (See: Chronic exertional compartment syndrome)
  184. Complex regional pain syndrome
  185. Complicated bereavement (See: Complicated grief)
  186. Complicated grief
  187. Compulsive gambling
  188. Compulsive hoarding syndrome (See: Hoarding disorder)
  189. Compulsive overeating (See: Binge-eating disorder)
  190. Compulsive sexual behavior
  191. Compulsive stealing (See: Kleptomania)
  192. Concussion
  193. Condylomata acuminata (See: Genital warts)
  194. Congenital adrenal hyperplasia
  195. Congenital heart defects in children
  196. Congenital heart disease in adults
  197. Congenital megacolon (See: Hirschsprung's disease)
  198. Congenital myasthenic syndromes
  199. Congenital myopathies
  200. Congestive heart failure (See: Heart failure)
  201. Conjoined twins
  202. Conjunctivitis (See: Pink eye (conjunctivitis))
  203. Conn's syndrome (See: Primary aldosteronism)
  204. Constipation in children
  205. Contact dermatitis
  206. Convergence insufficiency
  207. Conversion disorder
  208. Cooley's anemia (See: Thalassemia)
  209. COPD
  210. Corns and calluses
  211. Coronary artery disease
  212. Corticobasal degeneration
  213. Costochondritis
  214. Costosternal chondrodynia (See: Costochondritis)
  215. Costosternal syndrome (See: Costochondritis)
  216. Cough headaches
  217. Cough, chronic (See: Chronic cough)
  218. Coxsackievirus infection (See: Hand-foot-and-mouth disease)
  219. Crabs (See: Pubic lice (crabs))
  220. Cradle cap
  221. Cramp, muscle (See: Muscle cramp: How to provide relief)
  222. Cramps, menstrual (See: Menstrual cramps)
  223. Cranial arteritis (See: Giant cell arteritis)
  224. Craniopharyngioma
  225. Craniosynostosis
  226. Creutzfeldt-Jakob disease
  227. Crib death (See: Sudden infant death syndrome (SIDS))
  228. Crohn's disease
  229. Croup
  230. Cryoglobulinemia
  231. Cryptorchidism (See: Undescended testicle)
  232. Cryptosporidiosis (See: Cryptosporidium infection)
  233. Cryptosporidium infection
  234. Curvature of the penis (See: Peyronie's disease)
  235. Curvature of the spine (See: Scoliosis)
  236. Cushing syndrome
  237. Cutaneous T-cell lymphoma
  238. Cyclic vomiting syndrome
  239. Cyclospora infection
  240. Cyclothymia
  241. Cyclothymic disorder (See: Cyclothymia)
  242. Cyst, Bartholin's (See: Bartholin's cyst)
  243. Cyst, ganglion (See: Ganglion cyst)
  244. Cyst, kidney (See: Kidney cysts)
  245. Cyst, ovarian (See: Ovarian cysts)
  246. Cyst, pancreatic (See: Pancreatic cysts)
  247. Cyst, pilonidal (See: Pilonidal cyst)
  248. Cyst, spermatic (See: Spermatocele)
  249. Cystic fibrosis
  250. Cystitis
  251. Cystitis, interstitial (See: Interstitial cystitis)
  252. Cysts, epidermoid (See: Epidermoid (sebaceous) cysts)
  253. Cysts, sebaceous (See: Epidermoid (sebaceous) cysts)
  254. Cytomegalovirus (CMV) infection
  255. Cytomegalovirus infection (See: Cytomegalovirus (CMV) infection)
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