The good news is that treatments are always improving and the majority of women diagnosed with breast cancer still live a long life.
Knowing the facts and being able to spot the signs of breast cancer could save your life.
The signs and symptomsThe most well-known symptom of breast cancer is a painless lump in the breast - other symptoms include the size or shape of the breast changing and dimpling or thickening of the skin on the breast. Scroll down to the bottom of this page for video info on how to check your breasts for lumps.
We've also got more medical information on breast cancer, its causes and symptoms and how its treated.
Test your knowledgeTake our quiz to see how much you know about breast cancer and your risk of getting it.
This Morning's Dr Chris shows you how to check your breasts
The breast cancer awareness guy helps with another breast checking demo