Heat Exhaustion or Heat Stroke? How to Tell the Difference in a UAE Summer

By August, most of us have stopped checking the temperature. You know what it is. You move between an air-conditioned flat, an air-conditioned car and an air-conditioned office, and the heat becomes something that happens in the thirty seconds between them.

That is exactly why heat illness catches people off guard here. It rarely announces itself. It builds over hours, often in someone who insists they are fine, and by the time it becomes obvious it has already crossed the line from uncomfortable to dangerous.

The difference between heat exhaustion and heat stroke is not a matter of degree. They are two different situations requiring two different responses, and confusing them costs time that a person having a heat stroke does not have.

Why a UAE summer behaves differently

In dry heat, sweat evaporates and cools you. Along the coast from Dubai to Sharjah, humidity climbs high enough that sweat sits on the skin instead of evaporating. You lose the fluid and the salt without getting the cooling benefit. That is why a humid 40°C August afternoon here can be harder on the body than a dry 45°C day inland.

The second factor is recovery. The body repairs itself from heat strain overnight. When night temperatures stay in the mid-thirties, that recovery does not fully happen, and strain accumulates across days. Someone working their fifth consecutive shift in the heat is not starting each day from zero.

The midday break protects the worst hours, not all of them

The Ministry of Human Resources and Emiratisation enforces the midday break from 15 June to 15 September, halting outdoor work in direct sunlight daily between 12:30pm and 3:00pm. It applies every day of that period, weekends and public holidays included, and this year marks the twenty-second consecutive year it has run.

It is a genuinely effective policy. But it is worth being clear about what it does and does not cover. The hours either side of it are still punishing. A 10:00am start in full sun and a 4:00pm return to site both carry real risk, and heat illness that begins mid-morning frequently surfaces in the afternoon. The break is a floor, not a full solution.

Heat exhaustion: the body asking you to stop

Heat exhaustion is what happens when fluid and salt losses outpace what is being replaced. The body is struggling but its cooling system is still working.

What it typically looks like:

• Heavy sweating, with skin that feels cool, pale or clammy

• Weakness, heavy fatigue, or muscle cramps in the legs, arms or abdomen

• Headache, dizziness, or feeling faint on standing

• Nausea, sometimes vomiting

• A fast, weak pulse

• Dark yellow urine, or not needing to pass urine for several hours

What to do. Move the person out of the heat into shade or air conditioning. Have them lie down and raise the legs. Loosen or remove heavy clothing. Cool the skin with wet cloths or a spray, focusing on the neck, armpits and groin where large blood vessels run close to the surface. Give cool water in sips, with an oral rehydration solution if you have one.

Most people improve noticeably within thirty minutes. If they do not, or if symptoms worsen at any point, treat it as an emergency.

Do not send someone back to work the same day because they feel better after an hour. They will be starting from a deficit, and the second episode tends to be worse than the first.

Heat stroke: a medical emergency

Heat stroke is the point at which the body's temperature regulation fails. Core temperature climbs past 40°C and keeps climbing. This damages the brain, kidneys, liver and heart, and it does so quickly.

The signs that separate it from heat exhaustion:

• Confusion, slurred speech, agitation, or behaviour that seems out of character

• Skin that is hot to the touch, often red, and sometimes dry — though in humid conditions the person may still be sweating

• Body temperature at or above 40°C

• Rapid, strong pulse and fast, shallow breathing

• Seizure, or loss of consciousness

If you remember one thing from this article, make it this: a confused person in the heat is a medical emergency until proven otherwise. Not tired. Not dehydrated. Not needing a rest. Confusion, disorientation or strange behaviour is the single most reliable warning sign that the line has been crossed, and it is the one people most often explain away.

What to do. Call 998 immediately. While waiting, move the person into shade or air conditioning, remove excess clothing, and cool them as aggressively as you can — cold water poured over the body, wet sheets, ice packs at the neck, armpits and groin, and constant fanning. Cooling in the first minutes matters more than anything else that will happen afterwards. Do not give fluids by mouth to anyone who is confused, drowsy or unconscious.

Who carries more risk than they realise

Outdoor workers are the obvious group, and the protections built around them exist for good reason. But heat illness is not limited to construction sites.

Higher risk applies to infants and young children, adults over 65, and anyone who is pregnant. It applies to people living with diabetes, heart disease or kidney disease. It applies to anyone taking diuretics, blood pressure medication, some psychiatric medications, or antihistamines — several common prescriptions blunt the body's ability to sweat or hold on to fluid. And it applies to anyone who arrived in the country recently, because the body takes one to two weeks of gradual exposure to adapt.

Add to that anyone already unwell with a stomach bug, running a fever, sleeping badly, or drinking heavily the night before. Each of those starts the day short on fluid.

Drinking water is not the whole answer

When you sweat for hours, you lose salts as well as water. Replacing only water dilutes sodium levels, which produces its own set of problems — headache, nausea, confusion — that can be mistaken for the heat illness you were trying to prevent.

For anyone working or exercising in the heat for more than an hour, water alone is not enough. Oral rehydration salts, electrolyte sachets or salted buttermilk-type drinks all work. Drink steadily through the day rather than in large amounts at break time. Go easy on energy drinks and very sweet drinks, which are common on site and do little for hydration.

The simplest check available to anyone: urine should be pale straw-coloured. Dark yellow means you are already behind.

For supervisors and employers

If you are responsible for a team working outdoors, four things make the biggest practical difference: shaded rest areas that people actually use, cool drinking water and electrolytes within easy reach of the work face, at least one person on site trained to recognise heat stroke, and a clear, rehearsed answer to the question who calls 998 and who meets the ambulance.

Care and Cure supports employers across the UAE with Managed Care programmes, including on-site clinical cover, heat stress awareness sessions delivered in workers' own languages, and rapid escalation into our clinic network when someone needs to be seen.

Common questions

Can you get heat illness if you work indoors?

Yes. Kitchens, warehouses, laundries and plant rooms regularly run hotter than outdoor shade temperature, and none of them are covered by the midday break.

Is dizziness after coming inside from the heat serious?

Usually it settles once you cool down and rehydrate. Get it checked if it keeps happening, if it comes with chest pain or breathlessness, or if you nearly faint.

How long does it take to recover from heat exhaustion?

Most people feel better within a few hours, but full recovery takes a day or two, and you stay more sensitive to heat during that time.

Should someone with heat cramps just stretch and continue?

No. Cramps are usually the earliest sign of significant salt and fluid loss. Stop, cool down and rehydrate properly.

This article is general health information and is not a substitute for individual medical advice. If you or someone with you is unwell in the heat, seek care.

If you're unsure whether symptoms need to be seen, book a teleconsultation with a Care and Cure doctor. For anything urgent, walk into your nearest clinic — Al Quoz, Sonapur, The HUB in Dubai South, DIP at Oval Mall, Sharjah or Umm Al Quwain. In an emergency, call 998.