Heat Stroke in the Philippines: What to Do, and How to Tell It From Dehydration or Dengue

What to do about heat stroke in the Philippines: the four things that matter first

Move them to shade or air conditioning, remove excess clothing, cool them actively with water and airflow, and give fluids only if they are fully alert. If there is confusion, seizure activity, or skin that is hot and dry with sweating switched off, treat it as heat stroke: keep cooling while you move them, and get to the nearest emergency room or call 911, the national emergency number in the Philippines.

What each step actually looks like:

• Move. Shade, airflow, a mall, a convenience store, an air-conditioned car. In a Philippine city the fastest cool room is usually the convenience store on the corner, not the walk back to the office.
• Undress. Open the collar, take off the jacket, remove shoes and socks. A soaked uniform left on the body badly slows heat loss.
• Cool actively. Wet the neck, armpits and groin, where large vessels run close to the surface, and fan them at the same time. Do not plunge them into ice water and do not pile on ice packs. An intense cold shock causes vasoconstriction and shivering, which slows the fall in core temperature rather than speeding it up.
• Rehydrate carefully. Only if they are fully awake, sitting up unaided and able to follow what you are saying. Use an electrolyte drink rather than plain water. Giving fluids to someone who is not fully conscious risks aspiration.

Cooling buys time. It is not the treatment. The earlier the core temperature comes down, the smaller the chance of lasting damage, so the correct sequence is cool while you travel, not cool first and decide about the hospital afterwards. How triage works locally, what to bring and how not to lose two hours in the waiting area is covered in the Philippine emergency room walkthrough.

Am I just uncomfortable in the heat, or is this actually heat stroke?

Heat illness comes in three tiers, and the dividing lines are whether sweating continues and whether the person is thinking clearly. Most of what people describe as being wiped out by Manila heat stops at tier two. Tier three is the one that kills.

• Heat cramps. Painful spasms in the calves, thighs or abdomen after heavy sweating. The person is alert, temperature is roughly normal, and the cause is salt lost in sweat that was never replaced. Stop, get into shade, drink something with salt in it, stretch gently. It usually settles within the hour.
• Heat exhaustion. Heavy sweating, pale clammy skin, dizziness, nausea, fast pulse, weakness, sometimes a mild temperature. Still alert, but no longer able to carry on. This tier demands that the activity stops now, with active cooling and fluids. Handled well it improves noticeably within an hour or two. Handled badly it slides into tier three.
• Heat stroke. Very high core temperature, altered consciousness (confusion, odd behaviour, nonsense speech, collapse), sometimes seizures, and classically though not always skin that has gone hot and dry because sweating has stopped. The window here is measured in minutes.

The turning point people misread is the moment sweating stops. Dripping with sweat in the Manila humidity means the cooling system is still running. Someone who was pouring sweat a moment ago, suddenly goes dry and hot, and starts answering the wrong question, has not recovered. That is the red flag.

There is a field test that needs no equipment. Ask them to sit up on their own and tell you today's date and where they are. A wrong answer or no answer means tier three, and tier three means the emergency room, regardless of how fine they seemed ten minutes earlier.

One more caution: a household thermometer reads surface temperature while heat stroke is defined by core temperature. A reading that is not especially high does not rule heat stroke out. Judge on consciousness and sweating instead.

Is my fever heat stroke or dengue in the Philippines? Five ways to tell

Look at three things: where the person was when it started, whether cooling helps, and whether there is retro-orbital pain and a rash. Heat illness follows the exposure and improves once the exposure ends. Dengue arrives out of nowhere, runs for two or three days or more, and shrugs off air conditioning entirely.

• Setting. Heat illness: hours on a site, a court, a beach, or in a car with no aircon. Dengue: no obvious trigger, possibly mosquito bites days earlier, or someone at home or in the office recently diagnosed.
• Response to cooling. Heat illness improves clearly within an hour or two of shade, fluids and active cooling. Dengue does not budge no matter how cold you make the room.
• Signature symptoms. Dengue brings features heat illness essentially never does: pain behind the eyes, severe bone and joint pain (hence breakbone fever), a rash appearing around day three to five, bleeding gums or nose, and a falling platelet count.
• Skin and sweat. Heat exhaustion is pale and clammy, heat stroke is hot and dry. Dengue patients sweat like any other febrile patient, with neither pattern.
• Duration. Heat illness handled properly improves the same day. A fever still running past 48 hours is not heat illness. Get a blood test.

The rule that should never be fudged: when in doubt, treat it as dengue and get bloods done. Mistaking heat illness for dengue costs you one blood draw. Mistaking dengue for heat illness can cost you the critical 24 to 48 hours after the fever breaks. Leptospirosis, which follows wading through floodwater, and typhoid also circulate here, and only bloods separate them. Test timing and admission criteria are in the guide to suspected dengue in the Philippines.

One trap applies to both: do not reach for ibuprofen or aspirin. If it turns out to be dengue, NSAIDs raise bleeding risk, and in a dehydrated, overheated person they are hard on the kidneys. Use paracetamol only, sold locally under names such as Biogesic, at label dose and on medical advice.

Dehydration in the Philippines: how to spot it and what to drink

The two most useful signs are urine colour and how often you are passing it. Dark yellow to amber urine, or half a day with no urine at all, is unambiguous dehydration. Add dry mouth, dizziness, a racing pulse, skin that is slow to spring back when pinched, a baby crying without tears, or an older person who has become oddly drowsy or muddled.

What to drink matters here, because sweating hard in Philippine heat and humidity strips out salt as well as water, and plain water alone can dilute sodium further. In order of preference:

• Oral rehydration salts. Every pharmacy stocks them, and locally everyone calls them oresol. Mix per the sachet instructions. This is the only option formulated to a medical ratio, and a couple of sachets in your bag costs almost nothing.
• Sports drinks cut with water. Too sugary neat, fine diluted roughly half and half, useful in a pinch.
• Coconut water, buko juice. High in potassium, sold on every corner, easy to drink. But its sodium content is low, so it is not an equivalent of ORS and is not enough on its own after heavy sweating.
• Clear soup or salted rice water. Equally effective, and easier for someone with no appetite.

How to drink it: small amounts, continuously, spread over time. Do not sink a litre in one go, which mostly provokes vomiting and leaves you worse off. On a site the practical rule is a mouthful every fifteen to twenty minutes, without waiting for thirst, because by the time you feel thirsty you are already down several hundred millilitres.

When intravenous fluids become necessary: vomiting that prevents drinking, diarrhoea that will not stop, several hours with no urine, creeping confusion, or a young child or elderly person refusing food and drink. At that point oral intake cannot keep up with losses. Clinics and private hospital emergency rooms here run IV fluids as routine.

Worth saying plainly: in the Philippines dehydration is at least as often gastrointestinal as thermal. Newcomers get traveller's diarrhoea constantly. Where the water and food safety lines actually sit is covered in the guide to tap water and food safety here.

Philippines hot season tips: reading the PAGASA heat index, not the thermometer

The hot months run March to May, locally called tag-init, with April and May usually the peak. What determines danger is not the air temperature but the heat index. PAGASA, the national weather service, publishes a daily heat index by station, and schools and workplaces plan around that number.

Why the index rather than the temperature: humidity here is high year round, so sweat does not evaporate and evaporative cooling fails. Thirty-four degrees at fifty per cent humidity and thirty-four degrees at eighty per cent are not the same event. PAGASA grades the index from caution up through danger and extreme danger, and once the danger band is reached, sustained outdoor work and hard exercise should shift hours or stop. Class suspensions on extreme days, announced locally as walang pasok, follow exactly this scale.

Practical scheduling in the hot season:

• Push outdoor tasks before ten in the morning or after four in the afternoon. Noon to three is the block to avoid.
• Wear light-coloured, loose, breathable clothing and a hat. A thin cotton shirt or a barong beats synthetics comfortably.
• Carry water and a sachet of ORS, particularly if you are a driver, a salesperson or a site supervisor out all day.
• Plan for power cuts. Peak demand brings rotating outages, known here as brownouts. Once the aircon stops, indoor temperatures climb fast, and that is where elderly people and infants get into trouble.
• Do not wait inside a parked car with the engine off while your ride is arranging itself. A closed cabin heats astonishingly quickly.

And for anyone newly arrived: acclimatisation is real and takes time. Deliberately lowering intensity for the first week or two is physiology, not softness. Which months are genuinely pleasant, and how the rain and heat break down month by month, is in the guide to the best time to visit the Philippines.

Five settings where heat illness actually happens, starting with working outdoors

Heat illness is not random. It clusters in a handful of settings, and recognising the setting is more useful than memorising symptoms.

• Outdoor sites and warehouses. Project sites run by Chinese companies are a recurring problem: newly arrived staff have not acclimatised and are reluctant to be the first to stop. The fix has to be a rule rather than a reminder — enforced rotation, scheduled water breaks, ORS kept on site rather than in the office. Broader staffing and site practice is covered in managing people in the Philippines as a Chinese employer.
• Island hopping and boat days. Sea breeze masks the load while UV arrives twice over, direct and reflected. Boats rarely have shade, and the drink of choice is usually beer. Alcohol accelerates dehydration, which makes this the classic combination failure of a beach itinerary. Route planning is in the island hopping guide.
• Basketball and gym sessions. Local games happen in the afternoon on open courts where surface temperatures are brutal, and mid-game nobody wants to be the one who stops.
• Sitting in traffic. An hour or two in Manila traffic is normal, jeepneys and habal-habal have no aircon, and even an air-conditioned car turns dangerous the moment the engine is off.
• Outages and older housing. Elderly people living alone and infants in rooms with no aircon carry the highest risk, and the afternoon-to-evening block is when it happens.

One risk group is consistently underestimated: people on long-term medication. Some antihypertensives, especially diuretics, along with antihistamines and certain psychiatric drugs, interfere with sweating and thermoregulation. Anyone with a chronic condition should raise this with their own doctor before a long stay and carry a written list of their medications.

Set the threshold lowest for infants, pregnant women, anyone over sixty-five, people carrying significant extra weight, and anyone with heart, lung or kidney disease. The same symptoms in these groups should trigger a hospital decision much earlier.

When to go to hospital, which level of care, and what the bill is made of

Go straight to an emergency room, not a clinic, if there is altered consciousness, seizure activity, a temperature that will not come down, hot dry skin without sweat, vomiting that prevents drinking, or if the patient is an infant or an older adult. Anything else — alert, drinking, visibly improving with cooling — can reasonably be watched in the shade for an hour or two first.

• Emergency room. Any of the red lines above, anything at night, or anything that needs IV fluids. Private hospital emergency departments run around the clock. The process and the usual pitfalls are in the emergency room walkthrough.
• Clinic or outpatient. Daytime, mild symptoms, mainly wanting bloods to rule dengue out. Faster and cheaper. Registration, consultation and pharmacy steps are in how seeing a doctor works in the Philippines.
• Check your insurance before you leave. Many policies require pre-authorisation or only settle directly at network hospitals. Discovering at the counter that you must pay out of pocket derails every decision that follows. Policy comparison is in choosing health insurance in the Philippines.

What the bill consists of: emergency registration and physician fee, nursing procedures, IV fluids and drugs, laboratory work such as a complete blood count and electrolytes, an observation bed, and if admitted, the room-class differential on top. Public versus private, and a flagship city hospital versus a community one, can differ several times over, and the figures should be taken from the hospital's current schedule of fees. The full cost structure is in how Philippine emergency and admission costs are built up, and the hospital landscape in the Philippine hospital and healthcare system.

Local behaviour is instructive. Filipino families with a feverish, dehydrated child go directly to a private hospital emergency department with paediatric cover rather than waiting for a clinic slot, because outpatient queues are long and most clinics close at the weekend. That is not over-treatment. It is how care is actually distributed here.

A midnight ER run and an insurer asking for pre-approval — who handles that? → emergency assistance and medical liaison

Prevention: for yourself, and for a team you are responsible for

Only three things really work at an individual level: shift the timing and intensity, sip electrolyte fluid continuously, and learn your own early warning sign. If you are responsible for a team or a family, those three have to become written rules rather than verbal reminders.

For yourself:

• Deliberately reduce outdoor intensity for the first week or two after arriving. Acclimatisation takes time and cannot be rushed by toughing it out.
• Make hydration a fixed action, a mouthful every fifteen to twenty minutes, rather than a response to thirst.
• Learn your own first signal. For most people it is head pressure followed by nausea. For some it is unexplained irritability. Stopping at the signal beats any remedy applied afterwards.
• Carry two things: a sachet of ORS and a hat.

If you run a site or a team:

• Write stop-work and rotation thresholds against the PAGASA heat index into the work instruction. Do not leave it to on-the-spot judgement by whoever is supervising.
• Keep cold water, ORS and a shaded rest point on site permanently, and make explicit that workers may use them without asking.
• Have at least one person with basic first aid training who knows how to cool someone actively and when to call the vehicle.
• Flag new hires and staff recently arrived from a temperate climate, and reduce their load for the first fortnight.
• Post the nearest hospital and emergency entrance, plus the list of network hospitals under the company policy, somewhere everyone can see it.

The point that gets missed most often: here, feeling wrecked by the heat is treated as a minor complaint, and staff will not be the first to call a halt. Saying out loud, and writing down, that stopping because of heat is permitted does more than another crate of bottled water. In this workplace culture people generally will not override an instruction from above, so the permission has to come from you first.