A closer look at the claims in this myth reveals it to be full of holes. Essentially, the hoax contends that anti-perspirants stop the body from purging itself of toxins via underarm perspiration. To the layman, this may sound very scientific and logical, so it is understandable that people might be duped. But the underlying premises are just not valid. For example, the purpose of underarm perspiration is to help regulate body temperature, not to purge toxins.
Sweat is composed of salt, water and a few body wastes.
Even if there were something carcinogenic in sweat, it could exit the body elsewhere. The underarms are not the only parts of the skin that perspire. For now, the bottom line is that no one knows what precisely causes breast cancer. But you definitely do not have to worry about avoiding anti-perspirants or deodorants. Cancer is a scary disease and myths such as this only serve to heighten people s fears.