What Causes Cancer?

Learn how potential carcinogens are tested and classified, find lists of known and possible carcinogens, and learn about cancer clusters.

Some types of cancer run in certain families, but most cancers are not clearly linked to the genes we inherit from our parents. Learn about the complex links between genes and cancer, as well as genetic testing and how it is used.

Learn about some of the most common causes of cancer, and what you can do to lower your exposure or risk.