There now appears to be a correlation with the  length of time you wear a Bra and cancer.

Research from America (US) has indicated that the longer you wear your Bra there is a higher likely hood of developing breast cancer.

Woman who wear their Bra 12 hour or more every day are 19 times more likely to develop breast cancer than those woman who wear Bras for a shorter time duration.

From this it consequently follows that woman who wear bras more than this i.e. even when they are sleeping are 113 times more likely to develop breast cancer than those woman who don’t sleep in their Bra.

This would point to toxins being trapped in the breast tissues due to pressure by the Bra on the Lymphatic system. 

This would then cause energy and toxins to be trapped in the breast region of the body.

Very simple solution:

As a preventative measure wear your Bra less.