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. Cavernous malformations
  79. Cavities/tooth decay
  80. Celiac disease
  81. Cellulite
  82. Cellulitis
  83. Central nervous system vascular malformations
  84. Cercarial dermatitis (See: Swimmer's itch)
  85. Cerebral aneurysm (See: Brain aneurysm)
  86. Cerebral palsy
  87. Cerumen impaction (See: Earwax blockage)
  88. Cervical cancer
  89. Cervical dystonia
  90. Cervical osteoarthritis (See: Cervical spondylosis)
  91. Cervical spondylosis
  92. Cervicitis
  93. Chagas disease
  94. Charcot-Marie-Tooth disease
  95. CHD (See: Hip dysplasia)
  96. Chemical dependency (See: Drug addiction (substance use disorder))
  97. Chemo brain
  98. Chest pain
  99. Chest wall pain (See: Costochondritis)
  100. Chiari malformation
  101. Chickenpox
  102. Chilblains
  103. Child abuse
  104. Child maltreatment (See: Child abuse)
  105. Childhood apraxia of speech
  106. Childhood asthma
  107. Childhood obesity
  108. Childhood schizophrenia
  109. Chlamydia trachomatis
  110. Cholangiocarcinoma (bile duct cancer)
  111. Cholangitis, primary sclerosing (See: Primary sclerosing cholangitis)
  112. Cholecystitis
  113. Cholera
  114. Cholestasis of pregnancy
  115. Cholesterol, high blood (See: High cholesterol)
  116. Chondrosarcoma
  117. Chordoma
  118. Chorea, Huntington's (See: Huntington's disease)
  119. Choroid plexus carcinoma
  120. Chronic adrenal insufficiency (See: Addison's disease)
  121. Chronic cough
  122. Chronic daily headaches
  123. Chronic exertional compartment syndrome
  124. Chronic fatigue syndrome
  125. Chronic granulomatous disease
  126. Chronic hives
  127. Chronic kidney disease
  128. Chronic kidney failure (See: Chronic kidney disease)
  129. Chronic lymphocytic leukemia
  130. Chronic lymphocytic thyroiditis (See: Hashimoto's disease)
  131. Chronic myelogenous leukemia
  132. Chronic obstructive pulmonary disease (See: COPD)
  133. Chronic pelvic pain in women
  134. Chronic renal failure (See: Chronic kidney disease)
  135. Chronic sinusitis
  136. Chronic traumatic encephalopathy
  137. Chronic vulvar pain (See: Vulvodynia)
  138. Churg-Strauss syndrome
  139. Cirrhosis
  140. CJD (See: Creutzfeldt-Jakob disease)
  141. CKD (See: Chronic kidney disease)
  142. Claudication
  143. Cleft lip and cleft palate
  144. Click-murmur syndrome (See: Mitral valve prolapse)
  145. Clinical depression (See: Depression (major depressive disorder))
  146. CLL (See: Chronic lymphocytic leukemia)
  147. Clubfoot
  148. Cluster headache
  149. Coarctation of the aorta
  150. Coccidioidomycosis (See: Valley fever)
  151. Cold allergy (See: Cold urticaria)
  152. Cold exposure (See: Hypothermia)
  153. Cold sore
  154. Cold urticaria
  155. Cold, common (See: Common cold)
  156. Colic
  157. Colitis, ischemic (See: Ischemic colitis)
  158. Colitis, microscopic (See: Microscopic colitis)
  159. Colitis, pseudomembranous (See: Pseudomembranous colitis)
  160. Colitis, ulcerative (See: Ulcerative colitis)
  161. Collapsed lung (See: Pneumothorax)
  162. Collapsed lung (See: Atelectasis)
  163. Colon cancer
  164. Colon polyps
  165. Colonic ischemia (See: Ischemic colitis)
  166. Color blindness
  167. Colorectal cancer (See: Colon cancer)
  168. Coma
  169. Common cold
  170. Common cold in babies
  171. Common variable immunodeficiency
  172. Common variable immunodeficiency (See: Common variable immunodeficiency)
  173. Common warts
  174. Compartment syndrome, chronic exertional (See: Chronic exertional compartment syndrome)
  175. Complex regional pain syndrome
  176. Complicated bereavement (See: Complicated grief)
  177. Complicated grief
  178. Compulsive gambling
  179. Compulsive hoarding syndrome (See: Hoarding disorder)
  180. Compulsive overeating (See: Binge-eating disorder)
  181. Compulsive sexual behavior
  182. Compulsive stealing (See: Kleptomania)
  183. Concussion
  184. Condylomata acuminata (See: Genital warts)
  185. Congenital adrenal hyperplasia
  186. Congenital heart defects in children
  187. Congenital heart disease in adults
  188. Congenital hip dislocation (See: Hip dysplasia)
  189. Congenital megacolon (See: Hirschsprung's disease)
  190. Congenital mitral valve anomalies
  191. Congenital myasthenic syndromes
  192. Congenital myopathies
  193. Congestive heart failure (See: Heart failure)
  194. Conjoined twins
  195. Conjunctivitis (See: Pink eye (conjunctivitis))
  196. Conn's syndrome (See: Primary aldosteronism)
  197. Constipation
  198. Constipation in children
  199. Contact dermatitis
  200. Convergence insufficiency
  201. Cooley's anemia (See: Thalassemia)
  202. COPD
  203. Corns and calluses
  204. Coronary artery disease
  205. Coronary microvascular disease (See: Small vessel disease)
  206. Coronavirus
  207. Corticobasal degeneration
  208. Costochondritis
  209. Costosternal chondrodynia (See: Costochondritis)
  210. Costosternal syndrome (See: Costochondritis)
  211. Cough headaches
  212. Cough, chronic (See: Chronic cough)
  213. Crabs (See: Pubic lice (crabs))
  214. Cradle cap
  215. Cramp, muscle (See: Muscle cramp)
  216. Cramps, menstrual (See: Menstrual cramps)
  217. Cranial arteritis (See: Giant cell arteritis)
  218. Craniopharyngioma
  219. Craniosynostosis
  220. Creutzfeldt-Jakob disease
  221. Crib death (See: Sudden infant death syndrome (SIDS))
  222. Crohn's disease
  223. Croup
  224. CRPS (See: Complex regional pain syndrome)
  225. Cryoglobulinemia
  226. Cryptorchidism (See: Undescended testicle)
  227. Cryptosporidiosis (See: Cryptosporidium infection)
  228. Cryptosporidium infection
  229. CTCL (See: Cutaneous T-cell lymphoma)
  230. Curvature of the penis (See: Peyronie's disease)
  231. Curvature of the spine (See: Scoliosis)
  232. Cushing syndrome
  233. Cutaneous B-cell lymphoma
  234. Cutaneous T-cell lymphoma
  235. Cutting/self-injury (See: Self-injury/cutting)
  236. Cyclic vomiting syndrome
  237. Cyclospora infection
  238. Cyclothymia (cyclothymic disorder)
  239. Cyclothymic disorder (See: Cyclothymia (cyclothymic disorder))
  240. Cyst, Bartholin's (See: Bartholin's cyst)
  241. Cyst, ganglion (See: Ganglion cyst)
  242. Cyst, kidney (See: Kidney cysts)
  243. Cyst, ovarian (See: Ovarian cysts)
  244. Cyst, pancreatic (See: Pancreatic cysts)
  245. Cyst, pilonidal (See: Pilonidal cyst)
  246. Cyst, spermatic (See: Spermatocele)
  247. Cystic fibrosis
  248. Cystic fibrosis
  249. Cystitis
  250. Cystitis, interstitial (See: Interstitial cystitis)
  251. Cysts, epidermoid (See: Epidermoid cysts)
  252. Cysts, sebaceous (See: Epidermoid cysts)
  253. Cytomegalovirus (CMV) infection
  254. Cytomegalovirus infection (See: Cytomegalovirus (CMV) infection)
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