Sweat and smell
Sweating is the body's way of moderating internal temperature. Sweat − salt water − is secreted from pores in the skin and then evaporated from the surface of the skin. This process of evaporation radiates energy away from the skin, cooling the body down.
Sweat in itself doesn't actually smell. Body odour is caused by the waste products of bacteria that are found naturally on the skin, which thrive in humid sweaty environments, hence odour being more noticeable under the arms.
Hyperhidrosis is a condition that gives rise to excessive sweating. While hyperhidrosis does not pose a serious threat to health, it can cause significant emotional and psychological distress, embarrassment and can have a negative impact on a person's quality of life.