Treating heat exhaustion on Koh Phi Phi
Thirty-three degrees with eighty percent humidity does not sound extreme until you have walked the hill to the viewpoint in it. Sweat does not evaporate in air that wet, so your body’s main cooling system barely works. Heat exhaustion treatment in Koh Phi Phi is straightforward and quick — and knowing the point at which it stops being heat exhaustion is what makes the difference.
What heat exhaustion feels like
Heavy sweating, pale clammy skin, a fast weak pulse. Weakness and tiredness out of proportion to what you have done. Dizziness or feeling faint on standing. Headache, nausea, sometimes vomiting.
Muscle cramps, particularly in the legs and abdomen, are often the first sign and are caused by salt loss rather than dehydration alone.
The distinguishing feature is that the person is still sweating and still making sense. Body temperature is raised but usually below 40 degrees. Treated promptly this resolves within a few hours and leaves nothing behind.
Heatstroke, which is a different emergency
Heatstroke is heat exhaustion that has passed the point where the body can compensate, and it is life-threatening. Call 1669 and call us at the same time for:
- Confusion, slurred speech, agitation or strange behaviour
- Hot dry skin with sweating that has stopped
- Body temperature above 40 degrees
- Loss of consciousness, or a seizure
- A rapid strong pulse with rapid breathing
- Vomiting that will not stop
The sign people misread is the sweating stopping. It looks like recovery — the person is no longer drenched — and it is the opposite. Any change in behaviour or clarity of thought in someone who has been in the heat is heatstroke until proved otherwise.
What to do while getting help
Move into shade or air conditioning immediately. Lie the person down with legs raised. Remove excess clothing.
Cool actively: wet cloths or water over the skin with a fan or vigorous fanning, and ice packs at the neck, armpits and groin where large vessels run close to the surface. Evaporation is what cools, so wet skin plus moving air beats a cold towel left in place.
Give fluids only if the person is fully alert — oral rehydration salts if available, otherwise water, sipped rather than gulped. Never give fluids to somebody confused or drowsy. Do not give alcohol, and do not use a cold bath, which causes shivering and constricts the skin vessels you are trying to use.
Why this island catches people out
Humidity is the reason. In dry heat, sweat evaporates and cools you efficiently. At eighty or ninety percent humidity it runs off instead, so you lose the fluid and get almost none of the cooling.
Then the specific traps: the viewpoint climb, which is a steep set of steps in full sun that people start at midday with a small bottle of water; long boat days where the sun is relentless and the only drink on board is beer; and the first two days of a trip, before anybody has acclimatised.
Alcohol multiplies all of it. A big night, four hours of sleep, then a day trip in full sun is the sequence behind most of the cases we see, and it is worth naming because nobody thinks of last night’s drinking as a heat risk.
What treatment involves at the clinic
Cooling done properly and monitored, rather than guessed at. Temperature, pulse, blood pressure and oxygen tracked rather than described.
An IV drip with the right electrolyte balance is what turns this around quickly. Somebody who has lost several litres through sweat cannot drink it back fast enough, especially while nauseated, and an hour on a drip is usually the difference between the rest of the day being lost and being fine.
We also look for what else is going on, because heat exhaustion overlaps with several other things here — dengue, food poisoning and severe sunburn all produce a similar picture, and getting that wrong wastes a day.
Who is at more risk than they realise
Anybody on the first two or three days of a trip, before the body has adapted. Acclimatisation is real and takes about a week.
Older travellers, whose thirst response is blunted and who may be on medication that affects fluid balance — diuretics, blood pressure medication and some antidepressants all matter here. Children, who have a larger surface area relative to their size and often will not stop to drink. Anybody with a heart or lung condition.
And people who have been drinking, which means a substantial share of the island on any given day. Alcohol is a diuretic and it blunts the judgement you need to notice you are in trouble — see alcohol poisoning where the two overlap, which they often do.
Avoiding it in the first place
Drink before you are thirsty, and add electrolytes rather than relying on water alone. Sweating out three or four litres and replacing it with plain water dilutes your sodium, which produces its own set of problems.
Stay out of direct sun between eleven and three where you can, and do the viewpoint or Bamboo Island trips early rather than at midday. Wear light loose clothing and a hat, and take real breaks in shade rather than pushing through.
Check your urine. Pale and regular means you are keeping up. Dark, scant or absent for hours means you are behind before any symptoms have appeared, and that is the point at which this is easy to fix.
Afterwards, and the rest of your trip
Heat exhaustion leaves you more susceptible for several days. Take the following day easy, keep fluids up, and do not treat a morning of feeling fine as evidence that yesterday did not happen.
Do not dive within twenty-four hours of significant heat exhaustion. Dehydration is a recognised contributor to decompression illness, and a body that has just been that depleted has no margin — see dive medical.
If somebody is unwell in a room on one of the eastern bays and the walk in the heat is exactly the problem, we come to you. A doctor hotel visit at any hour is far more sensible than sending a person with heat exhaustion across the island to find us.
Frequently asked questions
How do I tell heat exhaustion from heatstroke?
Heat exhaustion: still sweating, still making sense. Heatstroke: confusion, sweating stopped, hot dry skin. That is an emergency — call 1669.
Why is the heat here harder than the temperature suggests?
Humidity. At eighty percent, sweat runs off instead of evaporating, so you lose the fluid and get almost none of the cooling.
What should I drink?
Oral rehydration salts rather than water alone. Replacing several litres of sweat with plain water dilutes your sodium.
Should I use a cold bath to cool someone down?
No. It causes shivering and closes the skin vessels you need. Wet the skin and fan it instead, with ice packs at neck, armpits and groin.
Does an IV drip help?
Considerably. Somebody several litres down cannot drink it back fast enough, especially while nauseated. An hour usually turns it around.
Who is most at risk?
Anybody in their first few days here, older travellers, children, people on certain medications, and anybody who was drinking last night.
Can I dive the next day?
Not within twenty-four hours of significant heat exhaustion. Dehydration contributes to decompression illness.
Can a doctor come to me?
Yes, at any hour. Sending someone with heat exhaustion across the island in the sun is the wrong direction of travel.
The island arithmetic, and where we fit in it
English-speaking doctors on site, 24 hours a day. It is worth spelling out why that matters rather than leaving it as a claim. Koh Phi Phi has no hospital, no road connection and no ambulance service. Getting to an emergency department means a boat, and the scheduled boats run in daylight — so for a good part of every twenty-four hours, the island’s own clinic is not the convenient option, it is the only one. Everything about how we are staffed follows from that single fact.
Beyond the island, Doctor Phi Phi Takecare Clinic belongs to the Takecare Clinic group, which operates across Krabi and Phuket. The practical value of that is continuity: if your treatment carries on after you leave, the next clinic already holds your notes, and a referral is a phone call between colleagues rather than a stack of paperwork you have to carry yourself.
Coming in
Doctor Phi Phi Takecare Clinic is 24 hours, every day, and that is the building being open with a doctor in it rather than a phone line that answers. No appointment is needed at any point, and there is no hour at which turning up is inconvenient for us. There are 2 branches on the island, about ten minutes apart on foot, and both keep the same hours — so head for whichever is closer rather than looking for the right one. Walk in, or reach us on +66 82 140 3858 or WhatsApp. If you would rather not move, ask for a doctor hotel visit and we will come to you.
If it turns out this is beyond what the island can treat, the same conversation is where the boat and the hospital transfer start being arranged. That process is worth beginning early rather than late here, because the options genuinely narrow as the evening goes on — and a decision made at nine is a considerably better decision than the same one made at two in the morning.