Can wearing a bra to bed increase your risk of breast cancer?

There is no credible research showing a link between wearing, or not wearing, a bra and developing breast cancer. It has been claimed that underwire bras cause breast cancer by obstructing the lymph flow, however, there is no scientific evidence to support this theory. Wearing a bra to bed is an individual choice and you can choose to do so without worrying about an increased risk of cancer.