The person with heat exhaustion still sweats but experiences extreme weakness or fatigue, giddiness, nausea, or headache. The skin is clammy and moist, the complexion pale or flushed, and the body temperature normal or slightly higher. Severe cases involving victims who vomit or lose consciousness may require longer treatment under medical supervision. Heat cramps , painful spasms of the muscles, are caused when workers drink large quantities of water but fail to replace their bodies' salt loss. Cramps may occur during or after working hours and may be relieved by taking liquids by mouth or saline solutions intravenously for quicker relief, if medically determined to be required.
Victims usually recover quickly after a brief period of lying down.
Moving around, rather than standing still, will usually reduce the possibility of fainting. Heat rash , also known as prickly heat, may occur in hot and humid environments where sweat is not easily removed from the surface of the skin by evaporation. When extensive or complicated by infection, heat rash can be so uncomfortable that it inhibits sleep and impedes a person's performance or even results in temporary total disability. Resting in a cool place and allowing the skin to dry can prevent it. Transient heat fatigue , refers to the temporary state of discomfort and mental or psychological strain arising from prolonged heat exposure.