Heat-related disorders encompass heat fatigue, heat cramps, heat exhaustion and - the most dangerous - heat stroke, also known as sunstroke. When heat is generated or gained by the body faster than it can be dissipated, heat illness occurs. Although the body initially attempts to compensate for the increased heat stress, the thermoregulatory mechanisms fail if the stress becomes too great. If this happens, development of hyperthermia accelerates and end-organ damage can occur.