As Bangladesh enters 2026, the country’s public health system finds itself facing a familiar yet worsening reality. Each year, new challenges emerge, but some crises no longer arrive as isolated shocks.
Instead, they unfold together, feeding into each other and exposing deeper structural weaknesses. Among these, extreme heat and dengue now stand out as a twin crisis, two public health threats that cannot be addressed separately, yet continue to be managed as if they were.
Bangladesh is no stranger to heat. But in recent years, the country has moved from uncomfortable summers to prolonged and increasingly dangerous heatwaves. Urban temperatures in cities now regularly cross levels that strain the human body, especially for outdoor workers, the elderly, pregnant women, and people with chronic illness.
Heat exhaustion, dehydration, kidney stress, cardiovascular diseases, and reduced work capacity are no longer rare or incidental outcomes; they are becoming routine features of the summer months.
The World Bank has cautioned that extreme heat in Bangladesh should no longer be seen as a short-term seasonal discomfort. It has pointed out that rising temperatures are already affecting people’s health and daily productivity, with broader consequences for the country’s economic stability and long-term prosperity.
It has also emphasized that Bangladesh will need a coordinated, cross-sector response, building on its past experience with climate adaptation to safeguard sustainable growth.
At the same time, dengue has transformed from a seasonal outbreak into a year-round public health threat. Once largely confined to the monsoon season, dengue cases are now being reported earlier in the year and persisting for longer.
Hospitals face recurring surges, diagnostic capacity remains uneven, and households repeatedly bear the financial and emotional cost of illness. Despite decades of experience with dengue, the national response remains largely reactive, with control measures often intensifying only after cases begin to rise.
The World Health Organization (WHO) has assessed Bangladesh’s national dengue risk as high, citing escalating case numbers, concerning fatality rates, and the disease’s spread across large parts of the country. The increasing burden of dengue is closely linked to unusually high temperatures, humidity, and rainfall, which create favourable conditions for mosquito breeding, alongside the wider effects of climate change.
What links these two crises is not coincidence but context. Rising temperatures accelerate the breeding cycle of Aedes mosquitoes, shorten virus incubation periods, and expand transmission windows. Heat also alters human behaviour, as people store more water, spend more time indoors in poorly ventilated spaces, and rely on informal cooling methods that inadvertently create mosquito breeding sites.
In dense urban neighbourhoods, heat and dengue reinforce each other in a feedback loop that places enormous pressure on public health infrastructure. Yet our systems continue to treat heat as a meteorological issue and dengue as a vector-control problem.
This separation is one of the core failures of public health planning in Bangladesh.
The burden of this twin crisis is not evenly distributed. Informal workers like rickshaw pullers, construction labourers, and street vendors face direct heat exposure without access to cooling, hydration, or healthcare. Many live in housing where water storage is unavoidable due to irregular supply, increasing dengue risk.
Slum settlements, with limited waste management and drainage, become hotspots where heat stress and mosquito proliferation intersect. Women, often responsible for caregiving, bear the compounded burden of managing illness while navigating heat-stressed households.
Healthcare facilities themselves are increasingly strained. Public hospitals are rarely designed for extreme heat. Overcrowded wards, poor ventilation, unreliable electricity, and limited cooling increase risks for both patients and staff.
During dengue surges, hospitals struggle with bed shortages and overworked personnel, conditions made worse when heat-related illnesses arrive simultaneously. The result is a system that is perpetually in crisis mode, never fully recovering before the next wave hits.
Despite clear warning signs, policy responses remain fragmented. Heat action plans, where they exist, are often limited to advisories rather than enforceable protections.
Dengue control focuses heavily on fogging, an intervention with limited long-term effectiveness, while neglecting sustained investments in urban planning, water management, and community-based prevention.
Climate adaptation strategies acknowledge health risks in principle but rarely translate into integrated, actionable health system reforms.
What is missing is a recognition that heat and dengue are not parallel crises but intertwined, happening as a result of a changing environment colliding with weak urban governance. Addressing one without the other is no longer viable.
An integrated public health response would begin with acknowledging heat as a health emergency, not just a weather anomaly. This means establishing heat surveillance systems, protecting outdoor workers through enforceable labour regulations, redesigning hospital infrastructure for thermal safety, and ensuring access to safe drinking water in high-risk communities.
At the same time, dengue prevention must move beyond seasonal campaigns to year-round vector control linked to water, sanitation, housing, and waste management systems. Surveillance systems for climate, vector density, and hospital admissions should communicate with each other, enabling early warning and targeted intervention.
Community health workers, already embedded in many areas, could play a stronger role in identifying heat stress, promoting safe water practices, and monitoring dengue risks, if they are trained, supported, and adequately resourced.
As Bangladesh starts the new year, the question is not whether heat and dengue will intensify -- they almost certainly will. The real question is whether public health policy will continue to chase symptoms or finally confront real causes.
The twin crisis of heat and dengue offers a stark warning; fragmented thinking produces fragile systems. For years, Bangladesh has shown resilience in the face of health emergencies, from infectious disease outbreaks to natural disasters.
But resilience cannot mean permanent emergency mode. It must mean anticipation, integration, and reform.
This January, as another year begins, heat and dengue should no longer be discussed as seasonal inconveniences or isolated threats. They are signals of a public health system at a crossroads, one that must adapt to a hotter, more disease-prone future, or risk leaving its most vulnerable citizens to bear the cost of inaction.
Md Jahedul Islam is a Public Health Researcher.