The research, conducted by Md. Zawadul Karim and Masuma Parvin of Gopalganj Science and Technology University and Md. Al-Mamun of the BRAC Institute of Governance and Development at BRAC University, focused on Gabura Union, a coastal settlement in the Shyamnagar sub-district of Satkhira District. This is a region that has endured a compounding series of catastrophes: tropical cyclones, tidal surges and the relentless, patient advance of riverbank erosion that gradually dissolves the very ground beneath people’s feet. Unlike a cyclone, which announces itself with wind and warning, erosion is a disaster measured in meters per monsoon season, a creeping loss that residents watch unfold over years while knowing they are largely powerless to stop it.

The study surveyed 385 residents aged 12 to 65, all of whom had lived in the area for more than 15 years and none of whom had a previously diagnosed mental disorder. Participants were selected through a multistage stratified sampling strategy, a design that divides the population into meaningful subgroups before sampling within each, ensuring that both severely affected and less affected residents were proportionally represented. Of the total, 280 participants had been directly exposed to severe riverbank erosion, while 105 had not, allowing the researchers to compare psychological outcomes across exposure levels.

Mental health was measured using two of the most widely validated screening instruments in psychiatric epidemiology. Anxiety symptoms were assessed with the seven-item Generalized Anxiety Disorder scale, known as the GAD-7, a brief questionnaire in which respondents rate how frequently they have been bothered by problems such as nervousness, uncontrollable worry and irritability over the preceding two weeks; higher cumulative scores indicate greater severity. Post-traumatic stress was screened with the PTSD Checklist for DSM-5, or PCL-5, a twenty-item instrument aligned with the current diagnostic criteria for PTSD that probes intrusive memories, avoidance behaviors, negative alterations in mood and cognition, and hyperarousal. Both instruments had previously been validated in Bangla translation for Bangladeshi populations, and the researchers also collected data on known risk factors, including loss of livestock, displacement experiences and levels of social support.

The results are sobering. Across the sample, 63.63 percent of participants produced positive scores on the anxiety screen, and 69.87 percent screened positive for PTSD. Prevalence was significantly higher among those directly affected by erosion, confirming that the psychological burden is not evenly distributed but concentrated among those whose lives the river has physically remade. The demographics of vulnerability followed recognizable patterns: middle-aged adults between 30 and 49 years old, members of joint multigenerational households, and illiterate individuals were disproportionately at risk. These are precisely the people who carry the heaviest economic and caregiving responsibilities in rural Bangladeshi society, and who possess the fewest resources for interpreting, expressing or treating psychological suffering.

The material devastation documented in the study helps explain these numbers. Erosion-induced losses were nearly universal among the worst-affected: 63.57 percent of respondents had lost livestock, and 64.65 percent had experienced displacement. In an economy where a family’s goats, chickens and cattle function simultaneously as savings accounts, food sources and income generators, losing them overnight to a collapsing riverbank is equivalent to financial ruin. Displacement compounds the damage, severing people from neighbors, kin networks and the social fabric that ordinarily absorbs shocks. The researchers found that this cascade of loss was associated with elevated risks not only of PTSD and anxiety, but also of insomnia and passive suicidal thoughts, a spectrum of harm that extends well beyond what conventional disaster assessments typically capture.

Yet the study also identified a powerful protective factor. Social support, the web of practical and emotional assistance that families, friends and communities provide, played a crucial role in mitigating psychological distress. This finding is consistent with a substantial international literature showing that social connection buffers the mental health impacts of disasters; research following Hurricane Katrina, the Fukushima disaster and flooding in the United Kingdom has repeatedly found that displaced individuals with strong support networks fare markedly better than those who face displacement alone. In Gabura Union, the implication is that the very communities the river is eroding are also the most important resource their members have for psychological survival.

The comparison with other natural disasters is instructive. Riverbank erosion differs from sudden-onset hazards in ways that may be uniquely damaging to mental health. A cyclone arrives, destroys and departs; the recovery phase, however painful, has a defined beginning. Erosion, by contrast, is chronic and anticipatory. Families live for years with the knowledge that their land may be next, watching neighboring plots crumble into the water, a form of sustained uncertainty that trauma researchers associate with prolonged stress activation. Moreover, because erosion displaces people gradually and often repeatedly, some families move multiple times in a decade, never reestablishing the stability needed for psychological recovery. The new study adds quantitative weight to earlier qualitative and small-scale findings from Bangladesh, including a 2021 PLOS ONE analysis of riverbank erosion’s mental health effects and a 2024 systematic review by some of the same authors documenting broad post-disaster mental health challenges across the country.

The authors argue that their findings demand a policy response that currently does not exist at scale. Bangladesh’s disaster management apparatus is largely built around sudden-onset events: cyclone shelters, early warning systems and emergency relief. Mental health care in rural coastal areas remains scarce, and psychological suffering is often stigmatized or attributed to spiritual causes rather than recognized as a treatable consequence of environmental loss. The researchers call for targeted mental health interventions and social assistance programs explicitly designed for erosion-affected populations, with an emphasis on community-based mental health care, which trains local workers to identify and support individuals in distress, and on sustainable social protection strategies that address the economic precarity underlying much of the psychological harm.

The broader significance of the work lies in what it suggests about the hidden costs of climate change. As sea levels rise, rainfall patterns intensify and Himalayan runoff shifts the hydrology of the Ganges-Brahmaputra delta, riverbank erosion in Bangladesh is expected to worsen, potentially displacing millions more people in the coming decades. Studies like this one make clear that the ledger of climate impacts must include anxiety disorders, PTSD, sleeplessness and suicidal ideation alongside the more easily counted metrics of hectares lost and homes destroyed. For the residents of Gabura Union who have watched the river take their fields, their animals and their front doors, the research offers something resembling validation: scientific confirmation that what has happened to their minds is a direct, measurable consequence of what has happened to their land, and that treating it will require more than rebuilding embankments. It will require rebuilding the conditions, social and material, under which psychological recovery becomes possible.

Climate-induced natural disasters—ranging from wildfires and hurricanes to prolonged droughts and flooding—constitute immediate traumatic events with severe psychological consequences. These extreme weather events cause acute anxiety, post-traumatic stress disorder (PTSD), depression, and elevated suicide rates, disproportionately affecting populations with pre-existing vulnerabilities. The researchers emphasize that the relentless frequency and intensity of such disasters deny affected individuals adequate recovery time, compounding cumulative psychological stress and chronic mental health disorders.

Particularly vulnerable are individuals with socioeconomic disadvantages, such as low-income groups, indigenous populations, children, the elderly, and those with pre-existing mental health conditions. Poverty often prevents access to adequate healthcare, increases exposure to climate hazards due to substandard housing or hazardous geographical locations, and limits social support systems, all of which amplify mental health risks during environmental crises. The systematic review underscores that mental health responses cannot be disentangled from social determinants of health in the context of climate change.

Beyond the immediate trauma of disasters, the slow-moving specter of climate change advances chronic psychological stressors. The subtle yet persistent impacts—including food and water insecurity, displacement and forced migration, loss of livelihoods, and a sense of ecological grief—fuel anxieties that infiltrate everyday mental well-being. Ecological grief, a relatively new psychological term, describes the mourning people experience due to environmental degradation and the loss of familiar natural landscapes, a phenomenon with escalating prevalence among indigenous communities closely connected to their environment.

The research also highlights intergenerational disparities in mental health impacts. Children and adolescents manifest heightened vulnerability due to developmental sensitivities, yet they often face insufficient recognition and support for climate-induced mental health challenges. Furthermore, the anticipation of future climate catastrophes provokes anxiety and despair in younger generations—a phenomenon labeled “climate anxiety”—which can result in feelings of helplessness and loss of agency that require urgent attention from mental health professionals and policymakers.

Methodologically, the systematic review analyzed a diverse spectrum of studies spanning multiple disciplines, including psychology, environmental science, public health, and social sciences. By synthesizing data extracted from longitudinal cohort studies, cross-sectional surveys, and qualitative interviews, the authors offer a comprehensive, evidence-based portrait of how climate change intersects with mental health outcomes. This integrative approach underscores the necessity of multidisciplinary strategies to address the escalating mental health burden.

One of the salient technical discussions in the review pertains to neurobiological mechanisms linking climate-related stressors to mental health disorders. The authors discuss how chronic stress from climate-related adversities activates the hypothalamic-pituitary-adrenal (HPA) axis, elevating cortisol secretion, which, when sustained, can lead to neural alterations associated with anxiety and depression. This scientific insight provides a biological explanation for the increasing prevalence of mental health disorders in populations continuously exposed to climate instability.

Another significant point of emphasis is the role of community resilience and social capital in mitigating mental health risks. Communities with robust social networks, effective communication, and cultural cohesion display better psychological outcomes following climate-related events. The systematic review calls for mental health interventions to incorporate community-based, culturally sensitive frameworks that empower resilience rather than perpetuate vulnerability.

The review also stresses the critical importance of integrating mental health support into disaster preparedness and climate adaptation policies. Traditional disaster response often prioritizes physical safety and infrastructure recovery, overlooking psychosocial support. The authors advocate for embedding mental health services into emergency response frameworks with adequate training for responders, sustainable funding, and accessible mental healthcare systems targeted at vulnerable groups.

Moreover, the interplay between climate change, forced displacement, and mental health figures prominently in the review. As rising sea levels, desertification, and subsistence farming failures push populations to migrate, forced displacement engenders multifaceted psychological challenges, including identity loss, cultural disintegration, and chronic uncertainty. The authors highlight the need for mental health care programs tailored for climate migrants and displaced persons, given their unique vulnerabilities and complex trauma profiles.

Climate change’s intersectionality with mental health also magnifies existing inequities within healthcare access and social justice. Marginalized populations often inhabit ecological frontline zones yet face disproportionate barriers to mental healthcare. The review calls for policy reforms to bridge these disparities by recognizing climate change as a social justice issue intricately linked with health equity.

In a forward-looking perspective, the review encourages the scientific community to develop innovative predictive models that incorporate psychoclimatic indicators—variables blending psychological and climatic data—to anticipate mental health trends linked with environmental changes. Such models could facilitate more proactive mental health services planning, potentially averting crises before they escalate.

The findings underscore the urgency for global governance frameworks to recognize mental health as a pivotal aspect of climate action agendas. International climate treaties and sustainable development goals must incorporate comprehensive mental health strategies to address the psychological toll of climate change systematically. The authors stress that without this integration, climate policies risk neglecting a critical dimension of human health and resilience.

In conclusion, Mahmood and colleagues’ systematic review serves as a critical wake-up call about the mental health consequences of climate change among vulnerable groups. By bridging cutting-edge neurobiological insights, social determinants, and community resilience concepts, the study lays a foundation for multidisciplinary solutions. This research not only advances scientific understanding but also provides a blueprint for policymakers, mental health practitioners, and communities to collaboratively confront an invisible but escalating pandemic born of our changing planet.

As societies urgently mobilize to combat the physical effects of climate change, equal emphasis must be placed on mental health interventions. Only by acknowledging and addressing the profound psychological impacts can humanity hope to build truly sustainable and resilient futures for all, especially the most vulnerable among us.

Subject of Research: The impact of climate change on mental health in vulnerable groups

Article Title: The impact of climate change on mental health in vulnerable groups: a systematic review

Article References: Mahmood, R., Clery, P., Yang, J.C. et al. The impact of climate change on mental health in vulnerable groups: a systematic review. BMC Psychol 13, 1208 (2025). https://doi.org/10.1186/s40359-025-03497-z

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