Do not let him or her drink too quickly. Do not give liquids with alcohol or caffeine in them. Remove or loosen tight clothing and apply cool, wet cloths such as towels or wet sheets. The victim's temperature control system, which produces sweating to cool the body, stops working. The body temperature can rise so high that brain damage and death may result if the body is not cooled quickly.
Help is needed fast.
Call for an ambulance, and move the person to a cooler place. Quickly cool the body by wrapping wet sheets around it. If you have ice packs or cold packs, place them on each of the victim's wrists and ankles, in the armpits and on the neck to cool the large blood vessels. Do not use rubbing alcohol because it closes the skin's pores and prevents heat loss. Watch for breathing problems and make sure the airway is clear.