Heat illness prevention outdoor work

Overview

Heat illness is a range of health problems caused by your body getting too hot, often from working or exercising in hot weather. It can be mild, like heat cramps or heat rash, or serious, like heat exhaustion and heat stroke, which can be life-threatening.

Yes, heat illness is common, especially during heat waves and for people who work outdoors in hot conditions.

It can affect anyone, but outdoor workers, athletes, children, older adults, and people with certain health conditions are at higher risk.

Symptoms

Common symptoms

• Heavy sweating
• Feeling weak or tired
• Dizziness or lightheadedness
• Nausea or headache
• Muscle cramps (often in legs or stomach)

Symptoms in children

• Fussiness or irritability
• Refusing to drink
• Skin that is hot and red
• Unusual sleepiness or confusion

Symptoms in older adults

• Confusion or disorientation
• Dry mouth and reduced sweating
• Weakness or fatigue
• Rapid, weak pulse

Causes

Main causes

• Prolonged exposure to high temperatures, especially during physical work outdoors
• High humidity, which makes it harder for sweat to evaporate and cool the body
• Not drinking enough water to replace fluids lost through sweating

Risk factors

• Working outside in direct sunlight for long shifts
• Wearing heavy or dark clothing that traps heat
• Having a medical condition like heart disease, diabetes, or obesity
• Taking certain medications (for example, for high blood pressure or allergies) that affect body temperature
• Being new to hot conditions or not used to the heat

When to see a doctor

See a doctor urgently if:

• If you or a coworker has signs of heat stroke (confusion, high body temperature without sweating, loss of consciousness) – call your local emergency number immediately.
• If symptoms like dizziness, nausea, or weakness get worse even after moving to a cool place and drinking water.

Book a routine appointment if:

• If you have recurring heat cramps or mild heat exhaustion that does not improve with self-care.

Diagnosis

A doctor will ask about your symptoms and your recent activities in the heat. They will also check your body temperature, pulse, and other signs of heat illness.

Tests that may be done

• Body temperature check (using a thermometer)
• Blood or urine tests to check for dehydration or organ problems
• Sometimes, a quick neurological exam to check for confusion or coordination

What to expect at your appointment

The doctor will ask simple questions like what you were doing when you felt unwell. They may take your temperature and check your heart rate. Most diagnosis is based on symptoms and exam results, not complex tests.

Treatment

Treatment depends on how severe the heat illness is. For mild cases, you can often recover at home. For severe cases like heat stroke, emergency medical treatment is needed.

Self-care at home

• Stop activity and move to a cool, shaded area or air-conditioned place
• Lie down with your legs slightly raised
• Drink small amounts of cool water, or a sports drink if available (avoid alcohol or caffeine)
• Cool your skin with a spray bottle, wet cloth, or fan
• Remove any extra clothing
• Never leave someone with heat illness alone until they are much better

Medical treatments

In a hospital, doctors may give intravenous (IV) fluids to rehydrate you, cool your body with ice packs or special cooling blankets, and monitor your vital signs. They may also treat any complications, such as organ problems, that arise from severe heat stroke. No specific medications are used for heat illness itself.

When is surgery considered?

Surgery is not needed for heat illness.

Living with this condition

If you have had heat illness, you may be more sensitive to heat for several days. Take it easy, stay in cool places, and drink plenty of water. Return to physical activity gradually only after feeling completely recovered.

Lifestyle tips

• Drink water regularly, even if you do not feel thirsty
• Take frequent breaks in the shade or a cool area
• Wear light-colored, loose, and breathable clothing
• Avoid working during the hottest part of the day (usually late morning to mid-afternoon)
• Acclimatise: if you are new to hot work, gradually increase your exposure over 1-2 weeks
• Watch for early signs of heat illness in yourself and your coworkers

Diet and exercise

Eat light meals that are easy to digest. When it is hot, avoid heavy, fatty foods. Exercise or do physical work early in the morning or later in the evening. Keep a water bottle handy and sip often.

Mental health and emotional wellbeing

Heat stress can make you feel irritable or anxious. It can also affect concentration, which increases the risk of accidents. Taking breaks and staying cool can help your mood and focus. If you feel very anxious or overwhelmed after a heat illness episode, talk to a healthcare provider.

Prevention

Yes, most heat illness can be prevented. Drink enough water, rest in the shade, wear appropriate clothing, and listen to your body. Employers should provide water, shade, and rest breaks for outdoor workers. Gradually getting used to working in heat (acclimatisation) also helps.

Complications

If left untreated

• Heat cramps can turn into heat exhaustion if you keep working in the heat.
• Heat exhaustion can progress to heat stroke, a life-threatening condition that can damage the brain, heart, kidneys, and muscles.
• Heat stroke can lead to organ failure or death if not treated quickly.

Long-term outlook

With prompt treatment, most people recover fully from heat illness. Severe heat stroke may cause lasting health problems, but the risk is very low if you get help early. Taking prevention seriously means you are unlikely to experience serious complications.

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