- CCD (Central core disease of muscle)
- CD4 count, absolute
- CDC
- cDNA
- CEA assay
- Cecum
- Celiac disease, adult
- Celiac disease
- Cell
- Cell cloning
- Cells, reproductive
- Centers for Disease Control and Prevention
- Centimorgan (cM)
- Central core disease of muscle
- Central nervous system (CNS)
- Centromere
- CEPH
- Cephalgia
- Cerclage
- Cerebellum
- Cerebral hemispheres
- Cerebritis
- Cerebrovascular accident
- Cerebrovascular accident (CVA) prevention
- Cerebrum
- Cervical
- Cervical cancer
- Cervical cerclage
- Cervical intraepithelial neoplasia
- Cervical dystocia
- Cervical rib
- Cervicitis
- Cervix
- Cervix, incompetent
- Cesarian section
- Cesarian section, lower segment (LSCS)
- Cesarian section, vaginal birth after
- Charbon
- CHAMPUS
- Chancre