Heat Stress and Heat Stroke: A First Aid Guide for Outdoor Workers

Heat Stress and Heat Stroke: A First Aid Guide for Outdoor Workers

Australian outdoor workers can spend hours in direct sun, high temperatures and heavy PPE, particularly across construction, landscaping, roofing, agriculture and civil work. Heat-related illness can range from heat cramps and exhaustion through to heat stroke, which is a life-threatening emergency.

The important thing is knowing what to look for, when to stop work and what to do if someone starts showing signs of becoming seriously overheated.

For employers, managing heat is also a WHS responsibility. Safe Work Australia's guidance says businesses must identify and manage the risks associated with working in heat, so far as is reasonably practicable. That means prevention comes first, with first aid forming part of the overall response if someone becomes unwell.

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Understanding Heat Stress, Heat Exhaustion and Heat Stroke

Heat-related illness is a broad term covering a range of conditions that can occur when the body is unable to keep itself cool enough.

Heat cramps can occur during demanding physical work in hot conditions and involve painful muscle cramps. Stopping activity, resting somewhere cool and replacing fluids and electrolytes can help manage them.

Heat exhaustion is more serious. Symptoms can include weakness, fatigue, headache, dizziness, nausea, heavy sweating, thirst and muscle cramps. Without appropriate action, heat exhaustion can progress to heat stroke.

Heat stroke is a medical emergency. It occurs when the body becomes dangerously overheated and can no longer regulate its temperature properly. Symptoms can include confusion, impaired judgement, unusual behaviour, rapid breathing, a rapid pulse, vomiting, collapse, seizures or loss of consciousness. A person with heat stroke may stop sweating, but they can also still be sweating, so don't rely on sweating alone to decide whether someone needs emergency treatment.

Heat stroke can cause serious organ damage or death if it isn't treated urgently.

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Warning Signs of Heat-Related Illness

Outdoor workers don't always recognise that they're becoming overheated, particularly when they're focused on getting a job finished. That's why crews should know what to look for in each other.

Early warning signs can include:

• Dizziness or feeling light-headed
• Headache
• Heavy sweating
• Excessive thirst
• Weakness or unusual fatigue
• Muscle cramps
• Nausea
• Visual disturbances
• Fainting

More serious signs include:

• Confusion or unusual behaviour
• Impaired judgement or coordination
• Rapid or difficult breathing
• Very high body temperature
• Vomiting
• Collapse
• Seizures
• Loss of consciousness

Not every person will display every symptom. If someone working in the heat becomes confused, collapses, has a seizure or appears seriously unwell, don't wait to see whether they recover on their own.

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First Aid for Heat Exhaustion

If a worker is showing signs of heat exhaustion, stop the work and get them somewhere cooler straight away.

• Move the worker to shade, air conditioning or another cool environment
• Stop physical activity and allow them to rest
• Remove unnecessary clothing or PPE that is trapping heat
• Cool the skin with cool water, wet cloths or a fan
• Give cool water or an appropriate electrolyte drink if the worker is conscious and able to drink safely
• Stay with the worker and monitor their condition
• Seek medical advice if symptoms are severe or don't improve

Don't send a worker who is recovering from heat exhaustion straight back into heavy physical work. They should recover properly and be monitored for any worsening symptoms.

If the worker becomes confused, collapses, has a seizure, cannot drink safely or develops other signs of heat stroke, treat it as an emergency and call triple zero (000).

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First Aid for Heat Stroke

Heat stroke is a medical emergency. Call triple zero (000) immediately and ask for an ambulance.

While waiting for emergency services, the priority is to cool the worker as quickly as possible.

• Move the worker to a cool, shaded area with circulating air
• Remove unnecessary clothing and PPE
• Start cooling immediately rather than waiting for the ambulance to arrive
• If practical and safe, immerse the worker in cold water while continuously monitoring them and keeping their airway clear
• If immersion isn't practical, splash or sponge the skin with cool or cold water
• Use a fan to increase airflow over the wet skin
• Apply cold packs or wrapped ice to areas such as the neck, groin and armpits
• Do not give anything by mouth if the worker is not fully conscious or cannot swallow safely
• Follow the instructions given by the triple zero operator and ambulance crew
• If the worker becomes unresponsive and is not breathing normally, begin CPR and follow the emergency operator's instructions

Safe Work Australia's first aid guidance recommends rapid cooling for suspected heat stroke and identifies cold-water immersion as the most effective cooling method where it is practicable and safe to use. :contentReference[oaicite:4]{index=4}

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Don't Wait for the Worker to "Push Through"

One of the problems with heat-related illness on construction sites is that workers can be reluctant to stop.

Someone might say they're fine, grab another drink and keep working. That's exactly why heat needs to be treated as a genuine workplace hazard rather than something workers simply need to tough out.

Supervisors and workers should be comfortable calling a stop when someone is showing warning signs. A five-minute interruption is a much better outcome than allowing a worker's condition to deteriorate into a medical emergency.

Safe Work Australia recommends training and supervising workers so they can recognise common symptoms of heat-related illness and receive first aid promptly. :contentReference[oaicite:5]{index=5}

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What Are Your WHS Obligations When Working in Heat?

Under the model WHS framework, a Person Conducting a Business or Undertaking (PCBU) must manage risks to workers' health and safety so far as is reasonably practicable. That includes risks associated with working in hot conditions.

Safe Work Australia's guidance recommends identifying the hazards, assessing the risk and implementing appropriate controls. Depending on the circumstances, this can include:

• Eliminating the exposure: for example, cancelling or postponing outdoor work when conditions are unsafe
• Reducing physical effort: using mechanical equipment or changing how tasks are performed where reasonably practicable
• Providing shade: particularly for outdoor work and recovery areas
• Providing cool, fresh drinking water: workers should have easy access to water
• Improving airflow: using fans or air conditioning where appropriate
• Scheduling work: moving demanding physical tasks to cooler parts of the day where reasonably practicable
• Providing suitable PPE and clothing: where PPE is required, consider whether it increases the heat burden on workers
• Training workers: everyone should know the signs of heat-related illness and what to do when they occur

Safe Work Australia also recommends additional risk assessment and controls during heatwaves, when conditions can become more hazardous and workers may be more fatigued. :contentReference[oaicite:6]{index=6}

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Heat Stress Isn't Just an Outdoor Problem

Although this guide is aimed at outdoor workers, heat-related illness can also occur indoors.

Roof cavities, poorly ventilated workshops, commercial kitchens, laundries and areas near hot machinery can all create significant heat exposure.

The same basic principle applies: identify the source of the heat, assess the risk and put controls in place rather than relying on workers to simply tolerate the conditions.

Safe Work Australia's guidance specifically recognises heat-related risks in both indoor and outdoor work environments. :contentReference[oaicite:7]{index=7}

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Where Does a First Aid Kit Fit In?

A first aid kit is only one part of your response to heat-related illness.

It shouldn't be treated as the solution to heat stress. Shade, water, appropriate scheduling, rest breaks, training and other risk controls are far more important for preventing workers from becoming seriously overheated.

However, a properly stocked first aid kit still has an important role on a construction site, in a work vehicle or with a mobile crew. A heat-related incident can happen alongside other workplace injuries, and having wound dressings, burn treatment, CPR protection and other first aid equipment immediately available means the crew is better prepared for a range of emergencies.

The Trade Aid Compact Kit is suited to tradies, mobile workers and smaller crews who need a portable first aid kit that can travel between jobs. For larger crews and more demanding work environments, the Trade Aid Classic Kit provides a larger first aid setup with additional wound care and trauma supplies.

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How to Prepare Your Crew for Hot Weather

The best time to prepare for heat stress is before someone becomes sick.

• Make sure workers know the signs of heat-related illness
• Keep cool drinking water readily available
• Identify shaded or air-conditioned recovery areas
• Review how demanding work is scheduled during hot weather
• Consider workers who are new to hot conditions or returning after time away
• Make sure workers know who to contact if they become unwell
• Keep first aid equipment accessible and make sure workers know where it is
• Have a clear emergency procedure for calling 000 and getting assistance to the work area

Safe Work Australia notes that workers who aren't acclimatised to heat, including those returning after time away, can be at greater risk of heat-related illness. Acclimatisation should not be relied upon as the only control measure. :contentReference[oaicite:8]{index=8}

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The Practical Takeaway

Heat stress is more than being uncomfortable on a hot worksite. It can progress from cramps and exhaustion to heat stroke, which is a life-threatening emergency.

Know the warning signs, make sure workers can stop and cool down when needed, and have a clear plan for dealing with someone who becomes seriously unwell.

For employers, the first priority is preventing excessive heat exposure through appropriate risk controls. First aid then provides the response when a worker does become affected.

If heat stroke is suspected, don't wait and see whether the worker improves. Call triple zero (000), start cooling immediately and follow the instructions provided by emergency services.

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This article provides general workplace safety information and is not a substitute for first aid training or medical advice. If someone is showing signs of heat stroke or another serious heat-related illness, call triple zero (000) and follow the instructions of the emergency operator.

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Tax and Business Expenses

If your business purchases first aid equipment for use in carrying on the business, the expense may be deductible depending on your circumstances. Keep your receipts and business records, and speak with your accountant or tax adviser if you're unsure about the tax treatment.

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