• Underwire bras
• Tight or poorly fitting bras
• Wearing a bra for too many hours
• Sleeping in your bra
Here’s the truth: There is no scientific evidence that wearing a bra causes breast cancer. The American Cancer Society clearly states: “There is no scientific or clinical basis for this claim, and a 2014 study of more than 1,500 women found no association between wearing a bra and breast cancer risk.” Still feeling unsure? Let’s break down where these myths come from, and why they don’t hold up.

1. Underwire or tight bras “block toxins” One myth says that tight or underwire bras block the lymphatic systemThis collection of tissues and organs helps rid the body of excess fluid and it plays a major role in the immune response to harmful substances., causing toxins to build up and lead to cancer. But here’s the science:

• • Breast cancer develops from geneticInherited characteristics. mutations, not trapped toxins.
  • There is no proven link between clothing and cancer risk.
  • Your bra doesn’t affect how your lymph system works.

2. Wearing a bra to bed “clogs your pores” Another myth claims that wearing a bra overnight prevents your skin from “breathing,” causing sweat and toxins to build up. This idea is not supported by any credible scientific research.

• • Skin doesn’t need to “breathe” the way lungs do.
  • Sweat isn’t a cause of cancer.
  • Top cancer experts, scientists, and surgeons all agree: this claim is not valid.

• The study behind the rumor has no scientific backing.
  The original claim came from a 1995 book by Singer and Grismaijer. The study was never peer-reviewed and ignored major risk factors like age and weight. Participants even knew the expected outcome, which is a major red flag.
• Men get breast cancer too.
  If bras caused breast cancer, men wouldn’t be at risk -but they are. That alone challenges the entire myth.
• Breast cancer existed long before bras.
  Cases were documented as far back as 1600 BC. Bras didn’t even exist until the late 1800s, and underwire bras came much later.

While bras don’t cause breast cancer, wearing the right one can affect your comfort. Poorly fitting bras may cause breast pain or tenderness. If you’re uncomfortable, it may be time for a professional bra fitting.

And as always, stay breast aware:

• • Perform regular breast self-exams
  • Know what feels normal for your body
  • Get routine clinical breast exams
  • Schedule regular mammograms if you’re over 40

If something doesn’t feel right, talk to your doctor. A quick check can give you peace of mind, and that’s always worth it.