Heatwaves and human health: the silent climate crisis
By Adebayo Adeleye Rising temperatures are no longer just a weather concern, they are a growing public health emergency affecting millions across Nigeria and beyond Across the globe, heatwaves are
By Adebayo Adeleye
Rising temperatures are no longer just a weather concern, they are a growing public health emergency affecting millions across Nigeria and beyond
Across the globe, heatwaves are becoming more frequent, more intense and more prolonged. What was once considered an occasional seasonal discomfort is now emerging as one of the most dangerous consequences of climate change. Yet, unlike floods or storms that leave visible destruction, extreme heat operates quietly, making it one of the most underestimated threats to human health. In Nigeria, the signs are already evident. Cities such as Kano, Maiduguri, Abuja and even Ibadan have recorded rising temperatures in recent years, with longer dry seasons and more oppressive heat conditions. For many residents, especially those without access to reliable electricity or cooling systems, coping with extreme heat is becoming increasingly difficult.
Heatwaves pose serious risks to human health. Prolonged exposure to high temperatures can lead to heat exhaustion, heatstroke, dehydration and, in severe cases, death. Vulnerable groups, including the elderly, children, pregnant women and outdoor workers, are particularly at risk. Healthcare professionals warn that heat-related illnesses are on the rise. Hospitals often see increased cases of dehydration, fatigue, dizziness and cardiovascular complications during periods of extreme heat. In regions where access to healthcare is already limited, these impacts can be devastating.
“Heatwaves do not make headlines like floods or storms, but they are among the deadliest consequences of climate change.”
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Beyond immediate health effects, extreme heat can worsen existing medical conditions such as hypertension, respiratory diseases and kidney disorders. It also places additional strain on healthcare systems that may already be stretched thin.
Urban areas are especially vulnerable due to the “urban heat island” effect. Buildings, roads and other infrastructure absorb and retain heat, making cities significantly warmer than surrounding rural areas. In densely populated Nigerian cities, this effect is intensified by poor urban planning, limited green spaces and high levels of air pollution. Informal settlements, often built with heat-retaining materials and lacking ventilation, become hotspots of extreme heat exposure. Residents in such areas may have little choice but to endure high indoor temperatures, particularly during power outages. This makes heatwaves not just an environmental issue, but a social and economic one.
Rising temperatures are also influencing the spread of diseases. Warmer conditions can expand the habitats of disease-carrying organisms such as mosquitoes, increasing the risk of malaria and other vector-borne diseases. In addition, heat can affect water quality and sanitation, raising the likelihood of waterborne diseases. Food spoilage becomes more common in hot conditions, increasing the risk of foodborne illnesses. These indirect effects highlight the complex ways in which climate change intersects with public health, often amplifying existing vulnerabilities.
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“Climate change is not only warming the planet, it is reshaping the landscape of disease and health risks.”
Extreme heat also carries economic consequences. Outdoor workers; farmers, construction workers, street vendors are among the most affected. High temperatures reduce productivity, increase fatigue and raise the risk of accidents. In agriculture, heat stress can affect crop yields and livestock health, threatening food security and livelihoods. For businesses, reduced worker efficiency and increased healthcare costs can impact overall productivity. The economic burden of heatwaves is often overlooked, yet it has far-reaching implications for national development.
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As heatwaves become more common, cities and governments must adapt. Public awareness campaigns can help people recognise the signs of heat-related illnesses and take preventive measures, such as staying hydrated and avoiding peak sun exposure. Urban planning also has a critical role to play. Increasing green spaces, planting trees and promoting climate-sensitive building designs can help reduce urban temperatures. Simple measures like reflective roofing and improved ventilation can make a significant difference. Access to reliable electricity is another key factor. Cooling systems, such as fans and air conditioners, can be lifesaving during extreme heat. However, energy access remains uneven in many parts of Nigeria, highlighting the need for investment in sustainable and reliable power systems.
Addressing the health impacts of heatwaves requires coordinated policy action. Governments must integrate climate risks into health planning, ensuring that healthcare systems are prepared for rising temperatures. Early warning systems for heatwaves, similar to those used for floods, can help communities prepare in advance. Schools, workplaces and public institutions should develop heat action plans to protect vulnerable individuals. At the national level, climate adaptation strategies must recognise heat as a major risk alongside flooding and desertification.
“Preparing for heatwaves today will determine how well societies cope with climate change tomorrow.”
Despite its severity, extreme heat often receives less attention than other climate-related disasters. There are no dramatic images of destruction, no immediate visual markers of crisis. Yet its impact is profound, affecting health, livelihoods and quality of life. For Nigeria and many other countries, the challenge is clear: to recognise heatwaves as a major public health issue and to act accordingly.
Climate change is reshaping the world in visible and invisible ways. While floods and storms capture headlines, heatwaves represent a quieter but equally dangerous threat.
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As temperatures continue to rise, the need for awareness, preparedness and adaptation becomes more urgent. Protecting public health in a warming world will require not only medical responses, but broader changes in how cities are designed, how energy is provided and how communities are supported.
In the end, the silent nature of heatwaves should not be mistaken for harmlessness. The real danger lies in underestimating a crisis that is already unfolding; one degree at a time.
