The human body is made up of billions of cells. Normally, these cells grow, divide and die in a controlled way to produce and replace the body's tissue. If something disrupts this controlled process a cancer can grow.

Breast cancer is caused when the cells that make up the breast tissue fail to die, instead they endlessly divide and eventually grow into tumours. Once a tumour has formed, some of the cells can break off and travel to other parts of the body, and then form other tumours.

If the problem can be detected early on, then there is a good chance it can be successfully treated. The more the cancer has spread, the more difficult it is to treat.


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Source: Breast Cancer Campaign