1. Cancer - out of control cell growth
2. Carcinogen - causes cancer
3. Carcinoma - cancer that originates in the covering or lining of organ
4. Caries - cavities in teeth
5. Cataract - clouding of the eye that can usually be surgically-corrected
6. Cephalgia - headache
7. Cerebral palsy - movement disorder caused by brain damage that occurs prenatally or during childhood
8. Coronary heart disease - accumulation of fat in a coronary artery
9. Cystic fibrosis - inherited disease in which thick mucus causes breathing difficulties