There is no conclusive evidence that deodorants and antiperspirants cause breast cancer.
Some people worry that deodorants and antiperspirants stop the body from sweating out toxins, which then build up in the lymph glands under the armpit, causing breast cancer. However, our bodies have several ways of getting rid of toxins and, while sweating is one of them, it does not involve the lymph glands.
There is also no conclusive evidence that ingredients in deodorants and antiperspirants – such as aluminum or chemicals called parabens – cause breast cancer.
Women are advised to avoid using a deodorant, antiperspirant or talc containing aluminum when they go for a mammogram only because the aluminum might show up on the x-ray image and give an inaccurate reading.