Four of the most reputable websites for medical information are the U.S. Centers for Disease Control, the National Institutes of Health, WebMD and the Mayo Clinic. These sites provide well-researched and accurate information at varying levels of detail.
These four websites have different focuses on health information that may make one site more suitable than another, depending on the issue. The WebMD and Mayo Clinic websites are geared toward general information about common diseases, while the Centers for Disease Control focus heavily on transmissible diseases. The National Institutes of Health provide a wealth of health-related information, much of it directed toward a scientific audience.