- CRO
- CROS hearing aid
- CRT
- CRTC1
- CRTC2
- CSF glucose
- CSR
- CST complex
- CT
- CT angiography
- CT enterography
- CT pulmonary angiogram
- CT scan
- CT urogram
- CTCF
- CTDI
- CTE
- CTEP
- CTGF
- CTL-mediated cytotoxicity
- CTLA-4
- CTP synthase
- CTP synthetase
- CUB domain
- CURB-65
- CUTL1
- CUX1
- CVLT
- CVS
- CX3CL1
- CX3CR1
- CXC chemokine receptors
- CXCL1
- CXCL10
- CXCL11
- CXCL13
- CXCL14
- CXCL16
- CXCL2
- CXCL3
- CXCL5
- CXCL6
- CXCL9
- CXCR2
- CXCR3
- CXCR4
- CXCR4 antagonists
- CXCR5
- CXCR6
- CXCR7
- CYLD
- CYP17A1 inhibitors
- CYP1A2
- CYP1B1
- CYP2A
- CYP2A6
- CYP2B6
- CYP2C19
- CYP2C8
- CYP2C9
- CYP2D6
- CYP2E1
- CYP2R1
- CYP3A
- CYP3A4
- CYP3A7
- CYP4F2
- CYR61
- Cabbage
- Cabenuva
- Cabergoline
- Cable theory
- Cabotegravir
- Cabozantinib
- Cacao
- Cachexia
- Caco-2
- Cacodyl
- Cacodylic acid
- Cadaverine
- Cadavers
- Cadazolid
- Cadherin
- Cadherin-1
- Cadherins
- Cadmium
- Cadmium nitrate
- Cadmium oxide
- Cadmium poisoning
- Cadmium selenide
- Cadmium sulfide
- Cadmium telluride
- Caecum
- Caesarean delivery on maternal request
- Caesarean section
- Caesium
- Caesium 137
- Caesium-137
- Cafe au lait spot
- Cafergot
- Cafestol
- Caffeic acid
- Caffeic acid phenethyl ester
- Caffeine
- Caffeine citrate
- Caffeine dependence
- Caffeine withdrawal
- Caffeine-induced anxiety disorder
- Caftaric acid
- CagA
- Cajal bodies
- Calamus
- Calbindin
- Calcaneal
- Calcaneal pitch
- Calcaneal spurs
- Calcaneocuboid joint
- Calcaneofibular ligament
- Calcaneus fracture
- Calcar
- Calcarine fissure
- Calcarine sulcus
- Calciferol
- Calcific tendinitis
- Calcification
- Calcifying odontogenic cyst
- Calcimimetic
- Calcimycin
- Calcineurin
- Calcineurin inhibitor
- Calcinosis
- Calcinosis cutis
- Calciphylaxis
- Calcipotriol
- Calcite
- Calcitonin
- Calcitonin gene-related peptide
- Calcitonin receptor
- Calcitriol
- Calcitriol receptor
- Calcitroic acid
- Calcium
- Calcium ATPase
- Calcium absorption
- Calcium acetate
- Calcium activated chloride channel
- Calcium activated potassium channel
- Calcium alginate
- Calcium aluminosilicate
- Calcium antagonist