Myth: Only women with a family history of breast cancer are at risk

Reality: Roughly 70 percent of women diagnosed with breast cancer have no identifiable risk factors for the disease. But the family-history risks are these: If a first-degree relative (a parent, sibling, or child) has had or has breast cancer, your risk of developing the disease approximately doubles. Having two first-degree relatives with the disease increases your risk even more.

More from Health.com: How to help a loved one cope with breast cancer

Credit: istockphoto