Distinguish heat cramps from heat stroke in terms of pathophysiology and clinical presentation.

• A. Heat cramps are a CNS emergency; heat stroke is due to dehydration
• B. Heat stroke presents with mild fever; heat cramps have CNS dysfunction
• C. Heat cramps are caused by dehydration and electrolyte loss with painful muscle contractions; heat stroke involves CNS dysfunction with extreme hyperthermia requiring urgent cooling
• D. Heat Stroke can be managed with rest and hydration alone

Answer: (C)

The distinction hinges on what drives the symptoms and how the body's heat-regulation system is functioning. Heat cramps come from fluid and electrolyte losses with heavy sweating, which makes muscles hyperexcitable and produce painful contractions. The CNS stays largely intact, and core temperature is not dramatically elevated, so the presentation centers on painful muscle cramps with signs of dehydration or electrolyte imbalance.

Heat stroke, on the other hand, is a failure of heat dissipation that drives core temperature to dangerously high levels while the CNS is affected. You see altered mental status—confusion, agitation, seizures, or coma—and a very high body temperature. This is a life-threatening emergency requiring immediate rapid cooling and supportive care.

So the best description combines dehydration and electrolyte loss causing painful muscle contractions for cramps, with CNS dysfunction and extreme hyperthermia requiring urgent cooling for heat stroke. The other statements mix up CNS involvement, fever level, and appropriate management, which don’t fit the true differences between these conditions.