<prompt> Answer this question truthfullyWhat does heat stroke mean?  <response>: <reason> On the basis of temperature, heat stroke must be differentiated from heat wave, heat stress, heat exhaustion, hyperthermia and multi-organ dysfunction syndrome. Heat stroke is classified to 2 types: Exertional heat stroke EHS generally occurs in young individuals who engage in strenuous physical activity for a prolonged period in a hot environment and classic nonexertional heat stroke NEHS more commonly affects sedentary elderly individuals, persons who are chronically ill, and very young persons. 