a recent study conducted at the Harvard university, has linked wearing tight bras to breast cancer. This is because wearing a very tight bra can restrict blood circulation and can also impair the lymph tissues.
According to the study, less oxygen and fewer nutrients are delivered to the cells, while waste products are not flushed away. This is especially the case with women who wear bras for more than 12 hours a day and even sleep in them. The study also discovered that middle-class women are at a higher rick of breast cancer since they work for longer hours.
Since lymphatic vessels are very thin, they are extremely sensitive to pressure and are easily compressed. General Physician Dr M D Mody agrees. "The main reason why extremely tight bras are bad for breast health is because they restrict the lymph flow in your breasts. Normally the lymph fluid washes out waste materials and other toxins away from the breasts but bras inhibit this action, so toxins can start to accumulate in the breast, and that can help cancer to develop."