Difference Between Heat Stress, Heat Exhaustion, and Heat Stroke
Original content by Safety Master.
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🏗 Real Site Example (Single Example to Understand All Three)
At a construction site in summer, a worker is performing manual labor under direct sunlight for several hours while wearing PPE.
1️⃣ At first, the worker begins to feel heavy sweating, thirst, and discomfort due to high temperature and humidity.
2️⃣ After some time, he feels weak, dizzy, tired, and starts sweating heavily because his body is losing water and salt.
3️⃣ If the situation continues and no treatment is given, the worker may suddenly collapse, become confused, and his body temperature becomes extremely high.
This single situation shows how heat illness can progress step by step.
📘 Explanation
🌡 Heat Stress
Heat stress happens when the body cannot properly cool itself because of high temperature, humidity, and physical work.
Signs may include:
Excessive sweating
Fatigue
Thirst
Discomfort
Heat stress is the early stage of heat-related illness.
🥵 Heat Exhaustion
Heat exhaustion occurs when the body loses too much water and salt through sweating.
Symptoms include:
Heavy sweating
Weakness
Dizziness
Headache
Nausea
If treated early with rest, shade, and water, the worker can recover.
🚑 Heat Stroke
Heat stroke is the most serious heat illness and can become life-threatening.
It occurs when the body temperature rises above about 40°C and the body can no longer control its temperature.
Symptoms include:
Very high body temperature
Confusion or unconsciousness
Hot and dry skin (sometimes no sweating)
Collapse
Heat stroke requires immediate medical emergency treatment.
📊 Simple Difference
Heat Stress - Body under heat pressure
Heat Exhaustion - Body losing too much water and salt
Heat Stroke - Body temperature control fails (medical emergency)
#HeatStress #HeatExhaustion #HeatStroke #ConstructionSafety #SummerSafety #SafetyMaster
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