Cancer is caused by changes in a cell’s DNA – its genetic “blueprint.” Some of these changes may be inherited from our parents, while others may be caused by outside exposures, which are often referred to as environmental factors. Environmental factors can include a wide range of exposures, such as:

• Lifestyle factors (nutrition, tobacco use, physical activity, etc.)
• Naturally occurring exposures (ultraviolet light, radon gas, infectious agents, etc.)
• Medical treatments (radiation and medicines including chemotherapy, hormone drugs and etc.)
• Workplace exposures
• House exposures

Damages done to body from carcinogens

Substances and exposures that can lead to cancer are called carcinogens. Some carcinogens do not affect DNA directly, but lead to cancer in other ways. For example, they may cause cells to divide at a faster than normal rate, which could increase the chances that DNA changes will occur.