- Cognitive-Behavioral Therapy
- Cold Agglutinins Test
- Cold Sore
- Colic
- Colon Cancer
- Colonic Irrigation
- Colonoscopy
- Color Blindness
- Colostomy
- Colposcopy
- Coma
- Common Cold
- Common Variable Immunodeficiency
- Complement Deficiencies
- Computed Tomography Scans
- Concussion
- Condom
- Conduct Disorder
- Congenital Adrenal Hyperplasia
- Congenital Amputation
- Congenital Bladder Anomalies
- Congenital Brain Defects
- Congenital Heart Disease
- Congenital Hip Dysplasia
- Congenital Lobar Emphysema
- Congenital Ureter Anomalies
- Congestive Cardiomyopathy
- Conjunctivitis
- Constipation
- Contact Dermatitis
