| CNN Health | Cable News Network on Health |
| CyberDocs | Yes! Real online doctors available |
| Cliniweb | USA Clinical Information |
| Cybersurgery | American Health on the Net |
| Cancer BACUP | A great support site for cancer patients and carers |
| Cancer Web | An online cancer medical dictionary |
| Chronic Fatigue Syndrome | Excellent Information source |
| Cancer Care | An information site on lung cancer |
| Cancer | Int. Journal of American Cancer Society |
| Chest | American College of Chest Physicians |
| Complementary Therapies in Medicine | Source of Books & Journals |
| Coronary Prevention Group | UK Health advice site |