What are the Risk Factors for Breast Cancer?

The two most important risk factors for breast cancer are age and family history of breast cancer.

Other risk factors for breast cancer include:

  • Atypical hyperplasia of the breast
  • Two or more normal breast biopsies
  • 75% or more dense tissue on mammogram for women over 45 years old
  • Radiation to the chest for women younger than 30 years old
  • First child born after 30 years old