📋 What You'll Learn
- What heat stroke actually is — and why 2026 is dangerous
- Heat exhaustion vs heat stroke — severity guide
- Symptoms to spot in 60 seconds
- First aid — what to do BEFORE the ambulance arrives
- What NOT to do (common mistakes)
- Who is most at risk
- When 108 is mandatory + city emergency contacts
- Prevention — daily habits during the heat wave
- Frequently asked questions
India is in the middle of one of its most intense heat waves on record. The IMD has issued red alerts across Delhi, Rajasthan, UP, Bihar, and parts of Maharashtra and Andhra Pradesh, with temperatures touching 47°C in May 2026. Heat stroke deaths are already in the news — and the next 6 weeks will be the deadliest stretch of the year.
This guide is built to be read fast: scroll, scan, act. If you can recognise heat stroke in 60 seconds and start cooling in the next 60, you can save someone's life before the ambulance arrives.
What Heat Stroke Actually Is — and Why 2026 Is Dangerous
Heat stroke is when your body's temperature regulation fails completely. Core body temperature rises above 40°C (104°F), the brain starts swelling, and organs begin shutting down. Without rapid cooling, mortality is 30-80%.
It's different from heat exhaustion (the milder, more common version): a heat-exhausted person sweats heavily and feels weak. A heat-stroke victim often stops sweating — their skin becomes hot and dry. That's the most dangerous moment.
- NCDC data: heat stroke deaths in India rose 60% from 2022 to 2025
- IMD forecasts above-normal heat through end of June for most of India
- Urban heat-island effect = cities are 4-7°C hotter than rural surroundings
- Night temperatures (warm nights = no recovery time) hit 32°C+ in Delhi already
- Power-cut hours mean fans/coolers don't work when you need them most
Heat Exhaustion vs Heat Stroke — Severity Guide
🟢 Heat Cramps
Painful muscle cramps after activity. Sweating heavy. Temperature normal. Action: rest in shade + ORS.
🟡 Heat Exhaustion
Heavy sweating, weakness, headache, nausea. Temp 38-40°C. Action: cool, hydrate, watch closely.
🔴 Heat Stroke
Confusion, dry hot skin, fast heart, may collapse. Temp 40°C+. Action: CALL 108 + cool aggressively.
Symptoms to Spot in 60 Seconds
If someone has been in heat and shows ANY of these — assume heat stroke until proven otherwise:
- Confusion, slurred speech, or strange behaviour — earliest brain warning sign
- Skin hot to touch but DRY (or red/flushed but not sweating) — sweating mechanism has failed
- Throbbing headache with dizziness
- Nausea or vomiting
- Rapid, shallow breathing
- Racing heart rate (over 120/min at rest)
- Loss of consciousness or seizure (severe stage — call 108 immediately)
- Very dark urine or no urination for hours (severe dehydration)
First Aid — What to Do BEFORE the Ambulance Arrives
You have 15-30 minutes to drop the body temperature before serious organ damage starts. Do these in order:
- Call 108 immediately. Tell them "suspected heat stroke" — they'll prioritise.
- Move the person to the coolest place available. AC room if possible. Otherwise shade, lowest floor, near a fan.
- Remove excess clothing. Especially tight, dark, or synthetic. Leave underwear.
- Cool the body aggressively. Pick the fastest available:
- Best: immerse in cool (not ice-cold) water — bathtub or large bucket
- Good: spray water over body + blow a fan strongly across them (evaporation cooling)
- Available anywhere: wet cloths/towels on neck, armpits, groin, head — these are where major blood vessels run close to surface. Change wet cloths every 2-3 minutes.
- Ice packs: wrap in cloth (never directly on skin), apply to neck, armpits, groin
- Hydrate ONLY if conscious and alert. Sip cool water, ORS, lemon water (nimbu paani), buttermilk (chaas), coconut water. Avoid sugary sodas, alcohol, caffeine.
- Keep monitoring breathing and consciousness until help arrives. If they stop breathing — start CPR (30 chest compressions + 2 breaths, repeat).
What NOT to Do (Common Mistakes)
- Don't give aspirin or paracetamol. Heat stroke fever isn't infection-driven — these don't help and may hurt the kidneys.
- Don't pour very cold/iced water directly on skin for prolonged periods — it can cause shivering (which actually raises body heat) or cardiac shock in elderly. Cool water + evaporation is safer.
- Don't try to make them drink if unconscious or confused — they can choke.
- Don't massage cramping muscles aggressively — gentle stretching only.
- Don't drive a heat stroke victim yourself unless 108 isn't available — they need cooling DURING transport, which is hard in a car. Wait for an ambulance.
- Don't dismiss recovery as "they're fine now" — heat stroke causes delayed organ damage. Always go to hospital.
- Don't give salt tablets or extra salt-loaded drinks — use balanced ORS instead.
Who Is Most at Risk
| Group | Why higher risk |
|---|---|
| Elderly (65+) | Weaker thirst sensation, fewer sweat glands, often on diuretics/BP meds |
| Infants and children <5 | Smaller body mass heats up faster, often can't communicate |
| Outdoor workers | Construction, farmers, food-delivery riders, traffic cops, street vendors |
| Athletes / fitness enthusiasts | Underestimate dehydration during midday workouts |
| Diabetics | Higher dehydration risk, autonomic neuropathy disrupts cooling |
| People on certain medications | Diuretics, antihypertensives, antihistamines, antipsychotics, alcohol |
| Pregnant women | Higher baseline body temperature + dehydration risk for the foetus |
| Slum / chawl residents | Tin roofs trap heat, no AC, often shared toilets reduce water intake |
When 108 Is Mandatory + City Emergency Contacts
Call 108 (Health Emergency Ambulance) for ANY of:
- Confusion, slurred speech, or change in behaviour
- Loss of consciousness or seizure
- Body temperature ≥40°C (≥104°F)
- Skin hot AND dry (no sweating)
- Vomiting that won't stop
- Very rapid heart or breathing
- Elderly or child showing any heat symptoms
Backup emergency numbers
| Number | Service |
|---|---|
| 108 | National health ambulance (most states) |
| 102 | Pregnant women / infant emergency ambulance |
| 112 | India's single emergency number (police/fire/ambulance) |
| 1075 | National Health Helpline |
Major city heat emergency hospitals
- Delhi: AIIMS Trauma Centre, Safdarjung Emergency, RML Hospital
- Mumbai: KEM Hospital, Sion Hospital, JJ Hospital — all have heat-stroke protocols
- Bangalore: Victoria Hospital, NIMHANS, Manipal HAL
- Hyderabad: Gandhi Hospital, Osmania General Hospital
- Chennai: RGGGH (Rajiv Gandhi Govt General Hospital), Stanley Hospital
- Ahmedabad: Civil Hospital — has India's largest dedicated heat-illness ward
Prevention — Daily Habits During the Heat Wave
- Drink 3-4 litres of fluids daily — water, nimbu paani, ORS, chaas, coconut water. Add jeera water (cumin) and tulsi for cooling.
- Avoid outdoor activity between 11 AM – 4 PM. Reschedule errands, gym, walks to early morning or after 7 PM.
- Wear light, loose, light-coloured cotton clothing. Avoid synthetics that trap heat.
- Cover head outdoors: wide-brim hat, gamcha, umbrella. Sunglasses with UV protection.
- Eat cooling foods: watermelon (90% water), cucumber, curd, sattu, raw mango (aam panna), bel sharbat.
- Avoid: alcohol, caffeine (coffee/strong tea), sugary sodas, heavy/spicy/oily meals at midday.
- Cool the home: close curtains during the day, open windows at night. Wet a sheet and hang in front of a fan = poor-man's AC.
- Check on elderly neighbours and outdoor workers — they often don't ask for help.
- Never leave children or pets in parked vehicles — even with windows cracked, temperature inside can hit 50°C in 10 minutes.
- Plan power-cut backup: battery fans, ice in freezer ready to use, ORS sachets in fridge.
🔍 Find ER doctors and 24×7 hospitals near you
NMC-verified emergency physicians, NABH-accredited hospitals with heat-stroke protocols, free to browse.
Browse Emergency Hospitals →Frequently Asked Questions
What temperature is considered heat stroke?
Body temperature ≥40°C (104°F) combined with neurological symptoms (confusion, seizure, unconsciousness) is the medical definition. But don't wait for a thermometer — if someone is in extreme heat and shows confusion + hot dry skin, treat as heat stroke immediately.
Can I die from heat stroke at home?
Yes. Without rapid cooling and medical care, heat stroke mortality is 30-80%. Most deaths happen in homes/workplaces, not hospitals — because help arrives too late. The first 30 minutes determine outcome.
Is heat stroke the same as "lu lagna"?
Yes — "lu lagna" / "loo lagna" in Hindi/Punjabi is heat stroke from hot dry winds. Same physiology, same treatment. Traditional remedies like raw mango pana, bel sharbat, and onion are mild prevention aids but NOT a substitute for active cooling and 108 in severe cases.
Should I give ORS or salt water?
ORS (Oral Rehydration Solution) is best — balanced electrolytes. Plain salt water can imbalance sodium. Make ORS with: 1 litre clean water + 6 teaspoons sugar + 1/2 teaspoon salt. Or buy ready-to-mix packets at any pharmacy.
How long does recovery take?
Mild heat exhaustion: rest + hydration for 24-48 hours, recovery complete. Severe heat stroke: hospital stay 3-10 days, full recovery 2-12 months — and some kidney/brain damage may be permanent.
Can heat stroke happen at night?
Yes — warm-night phenomena (Tmin > 30°C) prevents body from recovering between hot days. North India is now regularly seeing warm-night events in May–June. Continuous accumulation of heat stress can trigger heat stroke even after sunset.
Are children more at risk than adults?
Yes, infants and children under 5. They have smaller body mass that heats faster, sweat less efficiently, and often can't communicate their symptoms. Watch for: refusing to drink, less wet nappies, lethargy, fever-like signs without infection.
One-Page Heat Stroke Checklist (Save & Share)
- Hot dry skin + confusion = heat stroke. Call 108.
- Move to coolest place available. Strip excess clothing.
- Wet the body + blow a fan. OR wet sheet wrap. OR ice packs on neck/armpits/groin.
- If conscious: sip ORS, nimbu paani, coconut water.
- Never: aspirin/paracetamol, alcohol, sugary drinks, cold-water immersion if elderly heart patient.
- Don't drive them yourself — wait for ambulance unless absolutely necessary.
- Even after they "recover" — hospital check is mandatory.