Sweating is normal. In fact, it’s essential: Humans need to sweat in order to regulate body temperature. But some people sweat much more than is needed and this can significantly affect their quality of life. In some cases, problematic sweating is limited to one area of the body, such as the underarms or feet, a condition called focal hyperhidrosis. Other cases are more generalized, with sweating over large areas of the body. The most common areas affected by hyperhidrosis are the scalp, underarms, hands, feet and groin area. Botox injections use botulinum toxin to block the nerve signals responsible for sweating, stopping the sweat glands from producing too much sweat.