IMD heatwave alert: Doctors urge ORS intake as temperatures rise across districts
Synopsis
As the IMD warns of rising temperatures across multiple districts, doctors are flagging a surge in heat-related illness risk — and they say water alone won't cut it. The WHO-standard ORS sachet, often overlooked, is being positioned as a frontline defence against dehydration-linked organ damage this summer.
Key Takeaways
The IMD has warned of further temperature rises across several districts, with heatwave conditions expected to persist.
Doctors recommend two key measures : constant vigilance and regular intake of ORS (Oral Rehydration Solution) .
The average human body temperature is 36.9°C ; prolonged heat exposure can cause heatstroke , organ stress, and loss of consciousness.
A standard WHO-specification ORS sachet weighs 20.5 grams and must be dissolved in one litre of boiled, cooled water and consumed within 24 hours .
Authorities advise avoiding outdoor exposure between 11 am and 4 pm IST during peak heatwave days.
The India Meteorological Department (IMD) has warned that temperatures are likely to rise further across several districts in the coming days, with health experts cautioning that the risk of heat-related illnesses is increasing significantly. Doctors across Chennai and other affected regions stress that staying safe this summer requires two essential steps — constant vigilance and regular intake of Oral Rehydration Solution (ORS).
IMD Warning and Heatwave Outlook
According to the IMD, heatwave conditions are expected to persist across multiple districts in the near term, with mercury levels climbing steadily. Authorities have advised residents to avoid direct sunlight during peak hours and keep ORS readily available to prevent serious health complications. This alert comes as large parts of the country brace for an intense summer season.
How Heat Affects the Human Body
The average human body temperature is around 36.9 degrees Celsius. When external temperatures rise significantly above this level, the body begins absorbing heat from its surroundings. To counter this, it activates cooling mechanisms such as sweating and increased respiration. However, prolonged exposure to high temperatures can overwhelm these natural processes.
Excessive sweating leads to significant loss of water, glucose, and essential salts, sharply increasing the risk of dehydration. If not addressed promptly, this can result in muscle cramps, dizziness, fatigue, and in severe cases, heatstroke and loss of consciousness. Medical experts warn that dehydration can adversely affect vital organs, including the kidneys and heart.
Early Warning Signs to Watch For
Doctors urge the public to watch for early warning signs of heat-related illness, which include dry mouth, dark-coloured urine, muscle cramps, weakness, and light-headedness. Recognising these symptoms early can prevent escalation to life-threatening conditions. This is particularly important for the elderly, children, and outdoor workers, who are disproportionately vulnerable during heatwave conditions.
Why ORS Is Essential, Not Optional
While drinking adequate water is crucial, doctors emphasise that water alone may not be sufficient under extreme heat conditions. ORS helps replenish lost electrolytes and maintain the body's fluid balance more effectively than plain water.
As per World Health Organisation (WHO) standards, a standard 20.5-gram ORS sachet contains sodium chloride, glucose, potassium chloride, and trisodium citrate. It should be mixed in one litre of boiled and cooled water and consumed within 24 hours. Health authorities have advised that ORS sachets be kept readily accessible in homes, workplaces, and schools throughout the summer season.
Precautions and Public Advisory
Authorities have urged people to avoid venturing outdoors during peak heat hours, typically between 11 am and 4 pm IST, wear light-coloured and loose-fitting clothing, and stay in shaded or air-conditioned spaces wherever possible. With heatwave conditions expected to persist, early and consistent preventive action remains the most effective safeguard against heat-related emergencies in the weeks ahead.
Point of View
Health departments circulate tips, and public response remains patchy. What this cycle misses is targeted outreach to the most vulnerable: daily-wage outdoor workers, elderly residents without access to cooling, and children in non-air-conditioned schools. The ORS guidance is medically sound, but its impact depends entirely on last-mile distribution and awareness, neither of which receives the institutional urgency that the weather alert itself does. Until heat action plans move beyond press releases to verifiable ground-level intervention, the annual toll from preventable heat illness will remain stubbornly high.
NationPress
1 May 2026
Frequently Asked Questions
What has the IMD warned about heatwave conditions?
The India Meteorological Department (IMD) has warned that temperatures are likely to rise further across several districts in the coming days, with heatwave conditions expected to persist. Residents have been advised to take preventive measures and avoid peak-hour sun exposure.
Why do doctors recommend ORS during a heatwave?
Doctors recommend ORS because excessive sweating during high temperatures causes loss of water, glucose, and essential salts that plain water cannot fully replenish. ORS restores electrolyte balance more effectively and helps prevent dehydration-linked complications such as muscle cramps, kidney stress, and heatstroke.
How should ORS be prepared and consumed?
As per WHO standards, a 20.5-gram ORS sachet should be dissolved in one litre of boiled and cooled water. The solution must be consumed within 24 hours of preparation and should not be diluted further or mixed with other beverages.
What are the early warning signs of heat-related illness?
Early signs include dry mouth, dark-coloured urine, muscle cramps, weakness, and light-headedness. If these symptoms appear, the person should move to a cool area immediately, consume ORS, and seek medical attention if symptoms worsen.
Who is most at risk during a heatwave?
The elderly, young children, outdoor workers, and individuals with pre-existing conditions affecting the kidneys or heart are most vulnerable during heatwave conditions. Medical experts advise these groups to take extra precautions, including staying indoors during peak hours and maintaining consistent fluid and electrolyte intake.
