If you are a woman living in an urban area, you may have an increased chance of developing breast cancer. It seems women who live and work in large cities have more dense breast tissue than those in suburban and rural areas. Dense tissue increases risk.

This connection -- between risk and big cities -- may stem from the fact that urbanites tend to have kids later in life and are more likely to use hormone therapy. Pollution and stress may also play a role.

Regardless of the cause, researchers from the London Breast Institute say the risk is real. So if you live or work in a city, make sure you get your mammograms as recommended and if you learn that you have dense tissue, go to a facility that offers digital technology -- it can detect up to 50 percent more cancers in dense breasts. Regardless of where you live, really, you should follow these preventative strategies.