Heat exhaustion occurs with exposure to heat and significant fluid loss through sweating. Which key symptom is most commonly associated?

• A. Hyperthermia
• B. Heat Exhaustion
• C. Hypothermia
• D. Dehydration

Answer: (B)

Heat exhaustion happens when someone is in a hot environment and loses a lot of fluid through sweating. The symptom most commonly seen as a result of that fluid loss is dehydration—thirst, dry mouth, reduced urine output, and feeling lightheaded or weak. Dehydration comes directly from sweating, and it explains why someone with heat exhaustion often feels fatigue and dizzy. While body temperature can be elevated, extreme high temps define heat stroke, not heat exhaustion. So the key sign most closely tied to this condition is dehydration, reflecting the fluid loss from sweating. Rehydration and cooling are the typical first steps in management.