New Delhi: A 25-year-old marketing executive was admitted to the intensive care unit after consuming nearly five litres of plain water during a day spent working in Delhi’s extreme heat, highlighting the hidden dangers of incorrect hydration in soaring summer temperatures.
The young professional, who spends most of his day travelling across the city on a motorcycle for client meetings, believed he was staying hydrated by drinking water frequently while working under the furnace-like midday sun. However, he skipped breakfast due to a rushed morning and missed lunch amid back-to-back meetings. Throughout the day, he consumed no food, fruit, electrolyte drinks or oral rehydration solution—only plain water.
By evening, he began experiencing light-headedness and nausea, which he dismissed as fatigue. He continued working, but his condition worsened rapidly. His speech became sluggish, followed by unusual drowsiness and confusion, prompting concerned colleagues to rush him to the emergency department.
Blood tests revealed his sodium level had dropped to 124 mEq/L, well below the normal range of 135–145 mEq/L. Doctors diagnosed acute hyponatremia, a potentially life-threatening condition caused by excessive loss of sodium through sweating, compounded by overconsumption of plain water without electrolyte replacement.
Medical experts say such cases are increasingly being reported across India as temperatures regularly soar between 44°C and 47°C. Heat-related electrolyte imbalances are often mistaken for simple fatigue in their early stages, delaying treatment.
Sweating, the body’s natural cooling mechanism, releases not only water but also essential electrolytes such as sodium, chloride and potassium. These minerals are vital for nerve function, muscle activity, fluid balance and heart rhythm. Under extreme heat and physical exertion, these losses can become significant.
Doctors caution that the widespread advice to “drink more water” during summer, while well-intentioned, is incomplete. Excessive intake of plain water without adequate salt or electrolyte replacement can dilute sodium levels in the blood, triggering dangerous imbalances like hyponatremia. Experts stress the importance of electrolyte-infused fluids to maintain balance.
Sodium plays a critical role in regulating water movement in and out of cells, especially in the brain. When levels fall sharply, water enters brain cells, causing them to swell in a condition that can quickly become life-threatening due to the skull’s limited space. Early symptoms include headache, dizziness, nausea, fatigue and confusion, often mistaken for heat exhaustion.
If untreated, the condition can progress to severe drowsiness, seizures, loss of consciousness and coma.
Doctors warn that young, otherwise healthy individuals are particularly at risk, especially outdoor workers, delivery personnel, field executives, traffic police and construction workers who underestimate early warning signs.
Experts also highlight the opposite condition, hypernatremia, which occurs when fluid loss exceeds intake. In this case, dehydration concentrates sodium levels in the blood, causing cells—particularly in the brain—to shrink. Symptoms include intense thirst, dryness, irritability, confusion, muscle twitching and seizures, with potential for permanent neurological damage in severe cases.
Potassium imbalance is another serious risk during extreme heat. Heavy sweating combined with poor nutrition can lead to hypokalaemia, causing muscle weakness, cramps, fatigue and dangerous heart rhythm disturbances. In contrast, dehydration-related kidney stress can trigger hyperkalaemia, which may lead to sudden cardiac arrest.
Doctors emphasise that summer hydration is not just about drinking water but maintaining electrolyte balance. Oral rehydration solutions, buttermilk with salt, coconut water and lemon-salt drinks, along with regular meals, help restore essential minerals lost through sweat.
They also advise avoiding strenuous outdoor activity during peak afternoon heat, taking frequent shaded breaks and recognising early symptoms before they escalate into medical emergencies.
“The danger is often not dramatic collapse but silent electrolyte imbalance,” doctors said, warning that the condition can begin with mild dizziness and progress rapidly to neurological crisis if ignored.
The 25-year-old executive recovered after timely medical intervention, but experts caution that many similar cases may not end as fortunately, urging people to hydrate wisely and include electrolytes during extreme heat exposure.