What causes cancer?

There is no one single cause for cancer. Scientists believe that it is the interaction of many factors together that producer cancer. The factors involved may be genetic, environmental, or constitutional characteristics of an individual.

Anything that damages the genes in our cells can ultimately cause cancer. The vast majority of cancers are caused by DNA damage that accumulates over a person's lifetime ('sporadic' cancer). Cancers that are directly caused by genetic faults inherited from a parent are less common.