A significant heatwave is anticipated to affect extensive areas of India in the coming days, with temperatures expected to soar considerably. As reported by the India Meteorological Department, heatwave conditions are likely to sweep across central and eastern regions starting from mid-April. Cities such as Nagpur, Bhopal, Amravati, and Bhubaneswar may experience temperatures ranging from 42°C to 45°C. The National Capital Region, including Delhi, is also predicted to surpass 40°C for the first time this season, while parts of Uttar Pradesh and Rajasthan could reach between 42°C and 43°C.

Effects of Extreme Heat on Human Health

When exposed to rising temperatures, the human body faces increased stress. Research conducted by the University of Roehampton indicates that when temperatures exceed 35°C, an individual’s breathing rate escalates and heart rate increases. At approximately 40°C, the body exerts more energy to maintain a stable temperature, utilising nearly 35 per cent more energy. While core body temperature can remain stable for a limited period, extended exposure poses significant risks. Studies have shown that temperatures above 42°C can lead to severe health complications, including potential brain damage if an individual is exposed for a prolonged duration.

Health professionals warn that the consequences of extreme heat can be varied. According to experts conditions such as heat rash, severe dehydration, and heatstroke may arise, particularly in individuals with underlying health issues like diabetes or renal diseases. Heat exhaustion may manifest through symptoms such as profuse sweating, weakness, nausea, and muscle cramps. If left unchecked, heat exhaustion could escalate into heatstroke, where body temperature surpasses 40°C, leading to confusion, seizures, and potential organ failure that necessitates immediate medical intervention.

Further, excessive perspiration may result in dehydration and the depletion of essential salts, heightening the risk of dizziness and fainting. Additionally, extreme temperatures can disrupt digestive functions, as the body prioritises cooling over digestion. Increased blood flow to the skin reduces circulation to the digestive system, potentially resulting in sluggish digestion, discomfort, decreased appetite, acid reflux, or general indigestion. This issue is exacerbated by dehydration, leading to constipation and abdominal cramps, particularly in older adults or those who may not consume sufficient fluids in hot weather.

Mental Health Implications of High Temperatures

Extreme heat does not solely affect physical health; it also impacts mental well-being. Experts state that high temperatures can contribute to problems such as sleeplessness, irritability, and difficulties with concentration. Prolonged exposure to extreme heat can exacerbate conditions like anxiety and depression, as individuals may feel confined indoors or overwhelmed by the heat.

Research has further established a correlation between excessively hot days and increased hospital visits for various mood disorders and other mental health issues. This highlights a crucial aspect of health care that must not be overlooked amidst rising temperatures.

Safety Measures and Recommendations

To mitigate the adverse effects of extreme heat, individuals are encouraged to follow guidelines provided by the World Health Organisation. Keeping windows open during the night while closing them during the day, using blinds or curtains to obstruct sunlight, and reducing the use of electrical devices can help lower indoor temperatures. Fans operate effectively in cooler conditions, thus are suggested for use below 40°C, while air conditioning should ideally be maintained at 27°C, with a fan for enhanced cooling efficiency.

Staying hydrated is crucial; therefore, it is recommended that individuals drink between two to three litres of water daily and avoid alcohol and caffeine, as these can cause dehydration. Incorporating more fruits and vegetables into one’s diet, carrying oral rehydration solution when outdoors, and monitoring vulnerable populations such as children, the elderly, and individuals with chronic illnesses are also beneficial measures to adopt. As heatwaves become more frequent, heightened awareness and proactive steps are essential.

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