Per the Centers for Disease Control and Prevention (CDC), most forms of breast cancer occur in older women, but the disease does affect younger women, too — CDC reports that about 9% of new breast cancer cases in the U.S. are found in women under the age of 45. Breast cancer in young women is more likely to be hereditary, found at a later stage, aggressive, and difficult to treat. Having a family history of some types of cancer, including breast and ovarian cancers, are risk factors, which is why learning about your full family health history — and visiting a doctor to come up with a management plan — is crucial. It’s worth noting that there are other risk factors outside of having a family history of cancer, and CDC’s Bring Your Brave campaign provides helpful resources and information about breast cancer risk, signs, and symptoms for young women.