10. Aging


Ultimately, the risk of breast cancer increases with aging. Commonly, breast cancer is found in women aged 55 or older.

9. Genes


Nearly 5 to 10 percent of breast cancer cases are considered to be hereditary, meaning they occur due to gene defects that have been passed down from a parent. Having an inherited gene mutation of the BRCA1 or BRCA2 gene is the most common cause of hereditary breast cancer.

8. Family History

Family History

The American Cancer Society says that the majority of women (about 8 out of 10) who get breast cancer do not have a family background of cancer. However, by having a first degree relative with breast cancer, such as your mother, sister or daughter, the risk almost doubles, and having two first-degree relatives triples your risk. Less than 15 percent of women with breast cancer have a family member with the disease.

Related: 20 Things Science Has Linked to Cancer


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