Myth: Bras with underwire can cause breast cancer
Here’s The Truth
No matter what the type, bras do not cause cancer. There is no evidence to support the myth that lymph fluid is restricted when wearing an underwire bra (which sparked this myth decades ago) or any other type of clothing, although bras that do not fit well can cause discomfort and swelling. Likewise, no evidence supports the idea that going braless reduces the risk of breast cancer. Ultimately, it is important to find a bra that fits well and suits your lifestyle, whether you prefer underwires or not; many department stores now offer bra-fitting services.
American Cancer Society
American Association for Cancer Research
National Center for Health Research