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Breast cancer risk factors

Factors that may increase your risk of breast cancer
  • being a woman
  • getting older — the older you get, the greater your risk of breast cancer
  • having an inherited mutation in the BRCA1 or BRCA2 breast cancer genes
  • a personal history of breast or ovarian cancer
  • a family history of breast cancer
  • having high breast density on a mammogram
  • having a previous biopsy showing hyperplasia
  • being exposed to large amounts of radiation at a young age
  • never having children
  • having your first child after age 35
  • high levels of blood androgrens or estrogens
  • postmenopausal hormone use (in certain women)
  • being overweight after menopause or gaining weight as an adult
  • high bone density
  • having more than one drink of alcohol per day
  • starting menopause after age 55
  • being younger than 12 at the time of your first period
  • current or recent use of birth control pills

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