Heatwave raises health risks

Mumbai’s heat is not just making people tired. Doctors in the city say stomach infections have jumped by about 50% during the current hot spell, with many patients showing up with bloating, nausea, cramps, vomiting, diarrhoea and dehydration. (indianexpress.com) The pattern is simple enough to picture. Heat works like a fast-forward button for bacteria in food and water, so meals that might sit safely for a while in cooler weather can turn risky much faster in a hot, humid city. (economictimes.indiatimes.com) Doctors quoted in Mumbai say the biggest exposure points are ordinary summer habits: eating roadside food after hours outside, skipping meals, drinking too little water, and moving repeatedly between intense outdoor heat and heavily air-conditioned indoor spaces. Those stresses do not create infection by themselves, but they can leave the body less able to cope when contaminated food or water is added to the mix. (indianexpress.com) The cases are showing up especially among adults aged 30 to 45, according to the Indian Express report. That is also the group most likely to commute, work outdoors, eat on the move, and ignore early symptoms because they seem minor at first. (indianexpress.com) Travel makes the problem bigger. The World Health Organization says travel health risks rise with changes in temperature and humidity, stress, and uneven access to safe food, water, sanitation and medical care. (who.int) That is why stomach illness remains one of the most predictable travel problems. The United States Centers for Disease Control and Prevention says travellers’ diarrhoea is the most predictable travel-related illness, and its advice starts with the basics: safer food choices, safer drinks, and preparation before departure. (cdc.gov) In practical terms, a heatwave can turn a normal station meal or roadside snack into a trip-disrupting event. A few hours of vomiting or diarrhoea can mean missed trains, emergency clinic visits, dehydration during long waits, and added pressure on station staff and transport operations during already difficult summer conditions. This last point is an inference drawn from the medical and travel guidance, not a directly reported operational tally. (who.int, cdc.gov) India’s wider weather outlook helps explain why doctors are on alert. The India Meteorological Department said in its updated April to June 2026 seasonal outlook that many parts of the country are expected to see above-normal temperatures and an above-normal number of heatwave days. (mausam.imd.gov.in) Mumbai itself does not need record-breaking temperatures every day to feel the strain. Hot weather plus humidity can slow the evaporation of sweat, making dehydration easier and recovery harder, especially for people spending hours in traffic, on platforms, or outdoors for work. (merckmanuals.com, ndtv.com) The warning signs can be easy to dismiss at first. Mumbai doctors say mild bloating, nausea and stomach discomfort can be the opening act before more serious dehydration or infection sends someone to hospital. (indianexpress.com) The safest summer-travel routine is also the least glamorous one. Drink sealed or otherwise safe water, eat freshly cooked hot food instead of food left sitting out, wash or sanitize hands before eating, and do not treat early diarrhoea or vomiting as something to “push through” on a long journey. (travel.gc.ca, betterhealth.vic.gov.au) What Mumbai’s doctors are seeing is a local signal of a very old rule: when heat rises, small mistakes with food, water and hydration become bigger problems faster. In a city moving millions of people through summer days, that can turn one bad meal into a medical problem before the trip is even halfway done. (indianexpress.com, who.int)