India’s Heatwave Becoming a Public Health Emergency

India is witnessing increasingly intense and prolonged heatwaves every year, and health experts now warn that extreme heat is no longer just a seasonal discomfort but a serious public health emergency. Rising temperatures across several states are affecting millions of people, leading to dehydration, heat strokes, respiratory problems, and even deaths. With climate change making weather conditions more unpredictable, the impact of heat on public health is becoming impossible to ignore.

In recent years, temperatures in many parts of India have crossed dangerous levels during the summer months. Cities as well as rural regions are experiencing longer heatwave periods, especially during April, May, and June. Outdoor workers, elderly individuals, children, pregnant women, and people with chronic illnesses are among the most vulnerable groups. Many people living in crowded urban areas or without access to proper cooling facilities face the highest risk.

One of the biggest dangers associated with heatwaves is dehydration. Excessive heat causes the body to lose water and salts rapidly through sweating. If fluids are not replaced in time, it can lead to weakness, dizziness, low blood pressure, and severe dehydration. In more serious situations, people may develop heat exhaustion or heat stroke, which is considered a medical emergency. Symptoms such as high body temperature, confusion, rapid heartbeat, headache, and unconsciousness require immediate treatment.

Doctors are also reporting an increase in kidney-related problems during extreme summers. Continuous dehydration puts pressure on the kidneys and may worsen existing medical conditions. Patients suffering from heart disease, diabetes, asthma, and hypertension often experience worsening symptoms during intense heat exposure. Hospitals in several regions have seen rising emergency visits during heatwave periods.

Apart from physical illness, heatwaves also affect mental health and productivity. Studies suggest that extreme temperatures can increase irritability, stress, sleep disturbances, fatigue, and difficulty concentrating. Students, labourers, healthcare workers, and people working long outdoor hours are especially affected. In many areas, school timings and work schedules have even been adjusted due to dangerous daytime temperatures.

Another major concern is the unequal impact of heatwaves on poorer communities. Many low-income families do not have access to air conditioning, proper ventilation, or continuous electricity. People living in densely populated urban settlements often face higher temperatures because of the “urban heat island” effect, where concrete buildings and roads trap heat. This makes cities significantly hotter than surrounding rural areas.

Health experts believe climate change is playing a major role in worsening heatwaves globally, including in India. Rising global temperatures, deforestation, pollution, and rapid urbanization are increasing the frequency and severity of extreme heat events. According to the World Health Organization, heat-related illnesses and deaths are expected to rise further if preventive measures are not strengthened.

To reduce the health impact of heatwaves, experts recommend staying hydrated, avoiding direct sunlight during peak afternoon hours, wearing light clothing, and recognising early warning signs of heat-related illness. Government authorities in several states have also introduced heat action plans, public awareness campaigns, cooling centres, and emergency response systems during extreme weather conditions.

India’s heatwaves are no longer just an environmental issue; they are rapidly becoming a healthcare crisis affecting millions of lives every year. As temperatures continue to rise, stronger public health planning, climate awareness, and community preparedness will be essential to protect vulnerable populations and reduce preventable illnesses and deaths.

THE MEDICAL BULLETIN