The only thing we know for certain is that early detection and treatment gives us the best chance of beating breast cancer.
Be vigilant with your own body and make sure to seek medical help if you notice anything unusual.
Breast cancer is by far the most common cancer in women in the UK with one in eight women developing the disease during their lifetime. But scientists say they can't explain why the cancer occurs in some people and not in others. There are numerous causes and lots of factors to take into account, including lifestyle, hormone levels and other medical conditions. Basically, it's a complex picture and there's no point focusing on one factor only.