Heat Exhaustion vs. Heatstroke: How to Spot the Difference and Act Fast
Hot weather can turn dangerous quickly. Learn how to recognize heat exhaustion and heatstroke — and exactly what to do when someone needs help.
Heat Exhaustion vs. Heatstroke: How to Spot the Difference and Act Fast
When temperatures soar, the human body can only handle so much. Understanding the difference between heat exhaustion and heatstroke could genuinely save a life — including your own.
What Is Heat Exhaustion?
Heat exhaustion occurs when the body overheats and begins to struggle with controlling its internal temperature. It is not typically life-threatening, provided you act quickly and take steps to cool the person down. However, it should never be ignored.
The most recognizable symptom is heavy sweating, accompanied by an intense feeling of heat and general unwellness. This is your body sending an urgent warning signal to slow down and cool off — immediately.
Heat exhaustion doesn't discriminate. It can strike fit, healthy individuals — particularly those who have been exercising intensely in high temperatures or spending long hours drinking alcohol under the sun. Symptoms may develop rapidly within minutes, or creep up gradually over several hours.
Who Is Most at Risk?
While anyone can experience heat exhaustion, certain groups face a higher level of risk:
- Older adults, whose bodies may be less efficient at regulating temperature
- Young children, who may not be able to communicate how they are feeling and may instead appear limp or unusually drowsy
- People with long-term health conditions
- Those taking certain medications, which can impair temperature regulation, increase sun sensitivity, cause dizziness, or lead to dehydration
When Heat Exhaustion Becomes Heatstroke
Left untreated, heat exhaustion can escalate into heatstroke — a genuine medical emergency. At this point, the body is completely unable to manage its rising core temperature, and urgent medical attention is critical.
Warning Signs That Heatstroke May Be Developing
Seek immediate emergency help if someone:
- Still feels unwell after 30 minutes of resting in a cool environment and drinking plenty of fluids
- Shows signs of confusion, loss of consciousness, or stops sweating despite the heat
If heatstroke is suspected, call 999 immediately. Do not wait to see if the person improves on their own.
What to Do If Someone Has Heat Exhaustion
If you believe someone is suffering from heat exhaustion, follow these steps without delay:
- Move them somewhere cool — an air-conditioned room or a shaded outdoor area works well
- Remove excess clothing to expose as much skin to the air as possible
- Cool their skin actively — use a damp sponge, wet cloth, cold water spray, or cold packs placed around the neck and armpits; alternatively, wrap them in a cool, wet sheet
- Fan their damp skin — this promotes evaporation, which accelerates the cooling process
- Keep them hydrated — water is ideal, but sports drinks or oral rehydration solutions are also appropriate
With these measures in place, the person should begin to feel noticeably better within 30 minutes.
When to Call 999
If the individual shows no signs of improvement after 30 minutes of rest and cooling, escalate immediately. Call 999 and inform the operator that you suspect heatstroke. This is a time-sensitive emergency — every minute matters.
Stay Prepared in Hot Weather
Hot weather is becoming increasingly common, and knowing how to respond to heat-related illness is an essential part of staying safe. Whether you're at a summer event, exercising outdoors, or simply checking on a vulnerable neighbor, being equipped with this knowledge can make all the difference.
