China 
Africa 
- Catatonic schizophrenia
- Catch up growth
- Catechin
- Catechol
- Catechol estrogen
- Catechol o methyltransferase
- Catechol oxidase
- Catechol-o-methyl transferase
- Catechol-o-methyltransferase
- Catecholaminergic
- Catecholaminergic polymorphic ventricular tachycardia
- Catecholamines
- Catechu
- Catenin
- Catgut
- Catha edulis
- Catharanthine
- Catharanthus roseus
- Catharsis
- Cathartics
- Cathelicidin
- Cathepsin
- Cathepsin B
- Cathepsin D
- Cathepsin E
- Cathepsin G
- Cathepsin K
- Cathepsin L
- Cathepsin S
- Cathepsin V
- Cathepsin c
- Cathepsin f
- Cathepsin h
- Catheter
- Catheter ablation
- Catheterization
- Catheterization laboratory
- Catheters
- Cathexis
- Cathine
- Cathinone
- Cathodoluminescence
- Cation channel
- Cation exchange
- Cation exchange chromatography
- Cation exchange resin
- Cation transport
- Cationic liposome
- Cationic surfactant
- Cationic surfactants
- Cations
- Catonella
- Catsper
- Catumaxomab
- Cauda equina
- Cauda equina syndrome
- Caudal anaesthesia
- Caudal cell mass
- Caudal regression syndrome
- Caudate nucleus
- Caudle
- Caudovirales
- Caul
- Cauliflower
- Cauliflower mosaic virus
- Caulophyllum
- Causal attribution
- Causal inference
- Cause of cancer
- Cause of death
- Causes of schizophrenia
- Causes of seizures
- Caustic soda
- Cauterization
- Caveolae
- Caveolin
- Caveolin 1
- Cavernoma
- Cavernous hemangioma
- Cavernous nerves
- Cavernous sinus
- Cavernous sinus thrombosis
- Cavernous tissue
- Cavitary pneumonia
- Cavitation
- Cavo-tricuspid isthmus
- Cavoatrial junction
- Cavum septi pellucidi
- Cavum septum pellucidum
- Cayenne pepper
- Ccl12
- Ceacam1
- Ceacam3
- Ceacam5
- Ceacam6
- Cebocephaly
- Cecal
- Cecectomy
- Cecostomy
- Cecropin
- Ced-3
- Cediranib
- Cedrene
- Cefaclor
- Cefadroxil
- Cefalexin
- Cefalotin
- Cefamandole
- Cefatrizine
- Cefazolin
- Cefdinir
- Cefiderocol
- Cefixime
- Cefmetazole
- Cefodizime
- Cefonicid
- Cefoperazone
- Cefotaxime
- Cefotetan
- Cefotiam
- Cefoxitin
- Cefpirome
- Cefpodoxime
- Cefpodoxime proxetil
- Cefprozil
- Cefradine
- Ceftaroline
- Ceftaroline fosamil
- Ceftazidime
- Ceftibuten
- Ceftiofur
- Ceftizoxime
- Ceftobiprole
- Ceftobiprole medocaril
- Ceftolozane
- Ceftriaxone
- Cefuroxime
- Cefuroxime axetil
- Ceiling effect
- Celastrol
- Celecoxib
- Celery
- Celgosivir
- Celiac artery
- Celiac disease
- Celiac ganglia
- Celiac ganglion
- Celiac lymph nodes
- Celiac plexus
- Celiac plexus neurolysis