noOver the years, many factors have been studied to see whether or not they increase the risk of breast cancer. Some of these factors have been proven to be unrelated to breast cancer and do not increase (or in some cases, decrease) risk. A full list of these factors is too long to present here. Some, however, deserve mention here because they have been studied more than most or they have received quite a bit of media attention.

The factors below are listed alphabetically, not by level or risk or strength of evidence.

  • Abortion
  • Miscarriage
  • Blood organochlorine levels
  • Bras and underwire bras
  • Breast implants
  • Caffeine
  • Cell phones
  • Deodorant and antiperspirant use
  • Electromagnetic fields
  • Hair dyes and hair relaxers
  • Left-handedness
  • Trauma to the breast

For more information, visit the Susan G. Komen website.