How does sweating remove water from the body?

Sweating removes water from the body through a process driven by the sympathetic nervous system in response to rising body temperature. When the body overheats, the eccrine sweat glands are stimulated to secrete a fluid that is primarily water (typically about 99 percent) onto the surface of the skin.1

Once this liquid reaches the skin's surface, it cools the body through evaporation. Because water has a high heat of vaporization, the transition of sweat from a liquid to a vapor absorbs heat from the body, effectively dissipating it and helping to maintain a stable internal temperature. This mechanism is a vital component of thermoregulation, allowing the body to manage heat and prevent temperatures from reaching levels that would be detrimental to normal physiological functions.123