Clonorchiasis (Chinese leverbot)

Clostridiale myonecrose (gasgangreen)

Coagulopathie

Coarctatie van de aorta

Coccidioidomycosis

Coccidiose of microsporidiose

Coeliakie

Colitis ulcerosa

Colorectale kanker

Coma

Common variable immunodeficiency

Community-acquired pneumonie

Congestief hartfalen

Congestief hartfalen, rechtszijdig

Conjunctivitis

Constrictieve pericarditis

Contactdermatitis (allergisch of irriterend)

Contractuur van Dupuytren

Cor pulmonale

Cryoglobulinemie

Cryptococcosis (cryptokokkenmeningitis)

Cutaan T-cellymfoom (mycosis fungoides)

Cutane candidiasis

Cyanose

Cystic fibrose