First of all, congratulations for taking a small but important step in taking care of your body (nobody likes cancer)!An underarm detox can be an experience some people experience, particularly if you're switching from an antiperspirant deodorant to a natural one that doesn't include aluminum. In such cases, the body purges itself of the accumulated aluminum molecules which results in more sweating for a period of a few day to a week. Its a normal process. Many others don't experience any change at all.