If you think someone in India has heatstroke right now, call 112 for emergency help and begin cooling the person immediately. Move them to shade or an air-conditioned place, loosen unnecessary clothing, wet the skin with cool water, fan them and use cold packs if available. Confusion, collapse, seizures or altered consciousness in the heat are medical emergencies. Do not give drinks to a person who is confused, unconscious or cannot swallow safely. Do not wait for a thermometer or for sweating to stop.
If the person is alert but feels dizzy, weak, very thirsty or sick: stop exertion, move into a cool place, loosen clothing and drink safe water or oral rehydration solution in small amounts if able to swallow. Seek medical advice if symptoms persist or worsen. For current heat warnings, check the India Meteorological Department (IMD) heatwave guidance and your district forecast. For an urgent emergency in India, the national Emergency Response Support System uses 112.
Quick answer: A heatwave may begin with an official forecast, progress into consecutive hot days and warm nights, then cause growing heat exposure in workplaces, crowded homes, schools and outdoor travel. Dehydration, heat exhaustion and heatstroke can occur along the way; there is no fixed progression that everyone experiences. The most serious medical symptoms require emergency treatment immediately. Risks may continue after the hottest afternoon if the home remains hot overnight.
Eight urgent actions for an Indian heatwave
- Check today’s IMD district heat warning before outdoor work, travel or a long commute.
- Spend the hottest hours in a cooler location. Reduce strenuous tasks and reschedule non-essential outdoor activity where possible.
- Drink safe water regularly and replace fluid and salts lost through heavy sweating when appropriate; follow individual medical advice for fluid restrictions.
- Use shade, lightweight loose clothing, a hat and cool water on the skin when going outdoors.
- Check babies, older people, pregnant people, outdoor workers and people with chronic illness, especially when living alone.
- Never leave a child, dependent adult or animal in a parked vehicle, even briefly.
- If someone becomes confused, collapses or has a seizure in the heat, call 112, start rapid cooling, and do not give oral fluids.
- Keep following warnings through the night. A hot room can remain dangerous when the sun has set.
Sequence 1 — Days before: a weather warning is a planning signal
The India Meteorological Department uses observations, forecasts and district-level heatwave warnings to identify periods of unusual and potentially dangerous heat. The IMD Heat Wave Guidance page links to daily impact-based warnings, district information, short- and medium-range outlooks and explanatory material. A warning does not mean every person in every street will face identical conditions.
The danger depends on more than a single daytime temperature. Humidity affects how easily sweat evaporates. Strong sun and reflective concrete can increase exposure outdoors. Poorly ventilated rooms, heat stored in buildings, limited access to cooling and very warm nights can prevent recovery. A person who works outdoors may face the most intense exposure before an office worker notices anything unusual.
When the forecast identifies sustained heat, make a plan that answers specific questions: Can outside work be moved to cooler hours? Is safe drinking water available? Where is an actually cooler indoor space? Who is responsible for checking on an elderly neighbour? Does anyone rely on electricity-powered cooling or medical equipment?
A heat warning is not just a piece of meteorology. It is an early chance to change exposure.
Sequence 2 — Morning: heat stress can begin before noon
On a hot morning, people may feel capable of taking a long journey, playing sport or completing manual work. But exposure accumulates, particularly when the body begins the day dehydrated or has not cooled properly overnight. The first warning signs may be fatigue, headache, intense thirst, dizziness, nausea or muscle cramps.
Prepare before leaving home. Carry sufficient safe water; wear loose, light-coloured clothes; cover the head from strong sun and know where shade or a cooler building can be reached. Workers should discuss rest breaks and a buddy system so that a person showing unusual behaviour can receive help promptly.
India’s Directorate General Fire Services, Civil Defence and Home Guards advises avoiding direct sun, particularly between noon and 3 p.m., when practical. Local temperature patterns and working conditions vary, so the principle is to reduce exposure during the hottest hours shown in current forecasts rather than assume a rigid window makes other hours safe.
If someone has a medical reason to limit fluids or salt — for example, certain heart, kidney or other conditions — they should follow their clinician’s instructions, not a generic “drink a fixed number of litres” rule.
Sequence 3 — Afternoon: the difference between discomfort and danger
A heatwave can turn routine activities into significant exertion. Walking between bus stops, working at a construction site, selling goods in an unshaded market or cooking in a poorly ventilated room can increase body heat. The apparent temperature outdoors may be worse in humid conditions.
Possible heat exhaustion: heavy sweating, weakness, dizziness, nausea, headache and feeling faint. Affected people should stop work, go somewhere cool, loosen clothing, cool the skin and take fluids if they are alert and can swallow. They may require medical assessment, especially when symptoms are severe, persist or fail to improve quickly.
Possible heatstroke: confusion, disorientation, unusual behaviour, collapse, seizures, very high body temperature or loss of consciousness. A person with heatstroke may still be sweating; dry skin is not required. This is a medical emergency. Call 112 and start active cooling immediately.
Do not wait for heat exhaustion to become heatstroke before acting. Heat illness may develop rapidly under intense exposure, and the underlying medical conditions and medications of a person can change their risk.
Sequence 4 — If heatstroke is suspected: what to do in the first minutes
Follow this sequence while emergency services are being contacted. Use a second helper to call while the first starts cooling if several people are present.
- Call 112 and say that you suspect serious heat illness or heatstroke; give your exact location and symptoms.
- Move to a cooler place if this can be done safely: air-conditioned room, shaded ventilated area or another cooler location.
- Remove or loosen excess clothing and begin rapidly cooling the body with cool or cold water, wet cloths, fanning and cold packs. Safe cold-water immersion may help if enough assistance and equipment are available.
- Do not force fluids by mouth if the person is confused, vomiting repeatedly, drowsy, unconscious or unable to swallow safely.
- Monitor breathing and responsiveness. Follow the emergency dispatcher’s instructions. If the person is not breathing normally, begin CPR if trained or guided by the dispatcher.
- Keep cooling until professional help takes over, unless responders tell you otherwise.
Do not treat heatstroke with aspirin or paracetamol to “reduce the fever”; heatstroke is not an ordinary infection-related fever, and these medicines do not fix dangerous heat accumulation. Cooling and medical care take priority. WHO’s heatwave guidance explains these actions and the importance of rapid care.
Sequence 5 — Evening and overnight: a heatwave does not end at sunset
A home made of concrete can absorb heat throughout the day and remain warm at night. Crowded rooms and poor ventilation may make sleeping difficult. Children and older adults can be especially affected when they cannot explain that the room is too hot or cannot move to a cooler area on their own.
Where outdoor air is cooler and safe, ventilation at appropriate times may help. During very hot daytime hours, closing curtains or using shades can reduce solar heat entering through windows. Take cool showers or wet the skin with cool water, and sleep with light bedding. A fan can provide comfort, but in extreme heat an extremely hot room may still be unsafe; find an actually cooler location when possible.
An overnight power outage can remove fans and air conditioning. If home temperatures remain dangerously high, follow local public-health or municipal guidance about safer alternatives and transport. Do not try to cool a home by running a petrol generator indoors or beside openings into the building: carbon monoxide is deadly.
If a baby feeds less, an older adult becomes newly confused or someone stops urinating normally, seek medical advice promptly. Heat-related illness can coexist with dehydration, infection or other medical problems; a webpage cannot safely diagnose the cause from one symptom.
Sequence 6 — Following days: cumulative exposure and work decisions
Several hot days in a row may reduce a person’s ability to recover. Outdoor workers can be affected by daily repetition, especially if pay structures make breaks difficult. Employers and supervisors should arrange access to drinking water, shaded rest, job rotation where feasible and clear escalation when a worker shows symptoms. An explicit rule that workers can stop when unwell is more protective than merely hanging a heat advisory on a wall.
Families should check older relatives who live alone and neighbours with limited mobility. Do not rely only on the sentence “Call me if you need anything.” Ask specific questions: Is the room cool enough? Are you drinking? Have you felt dizzy? Is the power working? Can someone bring water or accompany you to medical care?
For students, avoid strenuous outdoor practice during heat alerts and follow school instructions. Schools should be prepared to move activities indoors, provide breaks and water, and recognise serious symptoms rather than assuming a child is simply tired.
Sequence 7 — When the forecast improves: recovery and prevention
A fall in the predicted maximum temperature does not instantly mean everyone has recovered from previous exposure. A person with heat exhaustion may still need rest and assessment before strenuous exertion. Someone treated for heatstroke needs professional medical follow-up and should not resume work or training based only on feeling better.
After the event, review which part of the plan failed. Did residents have access to a cooler space? Were workers able to take breaks? Was drinking water safely available? Did an older relative’s room remain hot at night? A useful recovery plan changes these practical constraints before the next hot spell.
People can prepare for heat by checking reliable warnings each morning, planning a cooler schedule and arranging support for those who would struggle to act independently.
An example: a delivery worker and an elderly relative
A delivery worker in an Indian city checks the IMD district advisory before leaving. The afternoon forecast indicates dangerous heat. The worker arranges more frequent water and rest breaks and postpones a non-essential physically demanding task. Later, a colleague becomes dizzy and nauseous. They stop work and move the person into a cool room rather than asking them to “walk it off”.
That evening, the worker checks on an older relative living in a warm top-floor flat. They arrange a cooler place to spend time and make sure someone can help if symptoms begin. This is an illustrative scenario, not a current forecast or a claim about a named city.
Dangerous misunderstandings to correct
- “If the person is sweating, it cannot be heatstroke.” Heatstroke can occur with sweating.
- “Every dizzy person needs only a glass of water.” Severe heat illness, fainting or other conditions may require urgent care.
- “A cold drink alone will reverse heatstroke.” Call emergency help and cool the body rapidly.
- “Paracetamol can cure heatstroke.” It is not a treatment for heatstroke.
- “The heat risk ends after sunset.” Hot buildings and nights can prolong exposure.
- “There is one water allowance for everybody.” Some patients need individual fluid guidance.
- “Only outdoor workers face danger.” Hot indoor spaces, crowded homes and inadequate cooling also pose risks.
A household heatwave checklist
- Save the IMD heatwave information page and check the forecast for your actual district.
- Keep the India emergency number 112 visible and easy to dial.
- Identify a cooler building or safe location accessible to every household member.
- Schedule unavoidable outdoor tasks for safer hours where possible.
- Make safe drinking water and appropriate rehydration supplies available.
- Prepare for electricity outages without using fuel-burning equipment indoors.
- Help older people, infants, people with disabilities and those with chronic health conditions maintain access to cooling and medical care.
- Teach family members the warning signs of confusion, collapse and seizures in the heat.
Frequently asked questions
What is the first thing to do if someone has heatstroke?
Call 112 and begin rapid cooling immediately. Move them to a cooler place and use cool water, wet cloths, fans or cold packs. Do not wait for a thermometer.
Can heatstroke happen even if someone is still sweating?
Yes. Severe heat illness does not always involve dry skin. Confusion, collapse, seizure or abnormal behaviour during heat exposure should trigger urgent medical help.
Is ORS useful in a heatwave?
It can help an alert person replace water and electrolytes after heavy sweating or certain dehydration situations. Follow package instructions and individual medical advice. Do not give ORS by mouth to someone who is unconscious or unable to swallow.
Is an electric fan always enough?
No. A fan can aid comfort and evaporation, but if the room is extremely hot, additional cooling or a cooler location may be needed.
Does an IMD forecast tell me whether my house is safe?
No. A district warning describes meteorological conditions and expected impacts; indoor heat varies with building design, ventilation, power availability and individual needs.
Official sources and related eduKate guides
- India Meteorological Department — Heat Wave Guidance: daily district-based heat information, bulletins and outlooks.
- India Ministry of Home Affairs — Emergency 112: nationwide emergency response number.
- Directorate General Fire Services, Civil Defence and Home Guards — Heat Wave: government advice on exposure, water, clothing and cooling.
- World Health Organization — Heatwaves: How to Stay Cool: heat illness warning signs and emergency cooling.
- WHO — Keep Cool in the Heat: preventing heat illness in households and communities.
- eduKate — Flood in Bangladesh: Sequence of Events: a separate South Asian weather hazard and its survival decisions.
- eduKate — Typhoon in the Philippines: Sequence of Events: how warnings guide action before major storms.
Reader note — reviewed 4 November 2026: General public-safety education, not a live heat alert or individual medical diagnosis. Confirm current district warnings with IMD. For suspected heatstroke, seek emergency medical assistance immediately; professional care takes priority over this article.