- Chlamydial Pneumonia
- Choking
- Cholangitis
- Cholecystectomy
- Cholecystitis
- Cholera
- Cholestasis
- Cholesterol Test
- Cholesterol, High
- Cholesterol-Reducing Drugs
- Cholinergic Drugs
- Chondromalacia Patellae
- Choriocarcinoma
- Chorionic Villus Sampling
- Chronic Fatigue Syndrome
- Chronic Granulomatous Disease
- Chronic Kidney Failure
- Chronic Obstructive Lung Disease
- Circumcision
- Cirrhosis
- Cleft Lip and Palate
- Clenched Fist Injury
- Clubfoot
- Cluster Headache
- Coagulation Disorders
- Coarctation of the Aorta
- Cocaine
- Coccidioidomycosis
- Coccyx Injuries
- Cochlear Implants
