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