In the quiet state, when the ambient temperature rises to 30 degrees Celsius, the body’s main form of heat dissipation is sensible evaporation in evaporative cooling, i.e. sweating. When the ambient temperature is greater than 30 degrees Celsius, the body’s other forms of heat dissipation are lost, which includes radiative, conductive, convective, etc., and they all need the ambient temperature below the skin temperature, that is, below 30 degrees Celsius. At this point, only sweating in evaporative cooling can play a role. The body’s sweat glands actively secrete sweat called sweating, which can take away a large amount of body heat, of which the ability to secrete sweat is the strongest sweat glands in the trunk, they can then maintain the balance of body heat in a hot environment. Ninety-nine percent of sweat is water, and most of the remaining one percent is sodium chloride. When sweating heavily, the body loses a lot of water and salt, which should be rehydrated in time. If rehydration is not timely, dehydration, fainting and other symptoms, you should seek medical attention in time to avoid delay.