This week, the UK is experiencing extreme heat, causing a severe heat temperature warning across the following areas: East Midlands, East of England, London & South East England, North West England, South West England, Wales, West Midlands, Yorkshire & Humber.
It’s important for everyone working on site to understand the risks of heat-related illness. While those working outdoors in construction, rail, and labour-intensive roles face the greatest exposure, heat-related illnesses can affect anyone.
Knowing how to recognise the signs of heat exhaustion and heat stroke, and understanding what action to take, is essential for keeping yourself and your colleagues safe.
What is Heat Exhaustion?
Heat exhaustion occurs when the body loses too much water and salt through sweating. It can develop gradually and is a warning sign that the body is struggling to cope with the heat.
Common symptoms include:
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Heavy sweating
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Dizziness or light-headedness
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Headache
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Nausea or vomiting
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Muscle cramps
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Tiredness or weakness
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Cool, pale, clammy skin
What to do?
If someone is showing signs of heat exhaustion, move them to a cool area, encourage them to drink water, loosen unnecessary clothing, and help them cool down. Most people recover quickly with prompt treatment.
What is Heat Stroke?
Heat stroke is far more serious and is a medical emergency. It occurs when the body’s temperature rises dangerously high and can no longer regulate itself.
Common symptoms include:
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Confusion or unusual behaviour
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Loss of consciousness
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Hot, red skin (which may be dry or sweaty)
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Rapid heartbeat
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Seizures
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Very high body temperature
What to do?
If heat stroke is suspected, call emergency services immediately. While waiting for help, move the person to a cool place and actively cool them using cold water, wet towels, or ice packs where available.
Staying Safe in the Office
Although office environments are generally lower risk, heat can still affect concentration, wellbeing, and productivity. Where air conditioning is available, ensure it is used appropriately and maintained correctly. Stay hydrated throughout the day, wear lightweight clothing where possible, and take regular breaks away from direct sunlight if your workspace is near windows. If the office becomes uncomfortably warm, speak to your manager about additional measures such as fans, adjusted working arrangements, or access to cooler areas.
Why It Matters
Heat exhaustion can progress to heat stroke if left untreated. That’s why early recognition and action are essential. Supervisors and workers should look out for one another, especially during hot weather, physically demanding tasks, or when wearing heavy PPE.
Remember: Heat exhaustion is a warning. Heat stroke is an emergency. Knowing the difference could save a colleague’s life.
