When the guns fall silent, violence often continues—not as bombs or bullets, but as a slow, invisible leak across time. The child who never saw a battle may still carry its marks. The teenager born years after a massacre may still feel rage toward a neighbour’s family. The generation that rebuilt a shattered village may still struggle to trust.
This is the silent architecture of intergenerational trauma and community‑level trauma, i.e., the process by which the psychological and biological wounds of conflict are transmitted to those who never directly experienced violence, and the way that entire communities lose their capacity for connection, hope, and collective action. Understanding these hidden fractures is not only a clinical task. It is a prerequisite for any peace that hopes to last.
Table of Contents
Defining Intergenerational Trauma and Transmission
Intergenerational trauma refers to the transmission of the psychological, biological, and social consequences of traumatic events from one generation to the next. Children and grandchildren of survivors frequently exhibit higher rates of depression, anxiety, post‑traumatic stress disorder (PTSD), and relational difficulties—even when they have not been directly exposed to violence.
In the context of families separated by conflict, “intergenerational transmission” is perhaps a better term, as it captures the active processes—epigenetic, psychological, relational, and sociocultural—by which trauma travels. These processes begin before a child is born and continue through parenting styles, family communication, community narratives, and even the physical design of post‑conflict societies.
Mechanisms of Transmission
Epigenetic Inheritance: The Biological Signature of War
Violence does not only leave memories; it leaves marks on DNA. A landmark study of three generations of Syrian refugees—published in Scientific Reports in 2025—provided the first human evidence that war‑related trauma can be biologically inherited across generations. The research team, led by a consortium of women scientists including Rana Dajani, Connie Mulligan, and Catherine Panter‑Brick of Yale University, identified 14 sites of DNA methylation that were altered in the grandchildren of women who had been pregnant during the Hama massacre in 1982, despite the grandchildren having no direct exposure to violence.
These epigenetic changes act like “light switches” on genes: the underlying DNA sequence remains unchanged, but the expression of certain genes is turned up or down in response to traumatic stress. Furthermore, children exposed prenatally to violence exhibited accelerated epigenetic aging, which is associated with long‑term health risks including cardiovascular disease, diabetes, and earlier onset of age‑related illness.
As the lead researchers emphasise, trauma can be biologically inherited, and adverse experiences can be imprinted in ways that shape future health and behaviour. Their work underscores a profound implication: if trauma leaves a heritable imprint, positive interventions—stability, care, safe environments—may also leave lasting biological benefits.
Parental and Relational Transmission
Biology alone does not tell the full story. A large study of Rwandan survivors of the 1994 genocide found that the trauma of survivor parents is transmitted to their children through three overlapping mechanisms: biological pathways, social patterns of silence and disclosure, and the child’s everyday contact with a traumatised parent. The annual genocide commemoration events can retrigger parental trauma and, in turn, the child’s distress.
In Rwanda, parental reluctance to speak openly about the genocide is often driven not by neglect but by a protective instinct: parents fear that disclosing the full horror will harm their children. However, the Yale School of Public Health has identified modifiable family factors that mediate transmission. For mothers with PTSD, nonverbal and guilt‑inducing communication patterns are associated with higher rates of PTSD in children. For fathers with PTSD, abusive or indifferent parenting styles are linked to increased anxiety and depression in offspring. These findings offer a precise roadmap for preventive interventions.
The phenomenon is not limited to genocide settings. A study of Cambodian refugee families resettled in the United States found that decades after the Khmer Rouge genocide, which killed an estimated 1.7–2 million people, survivors remain trapped in cycles of intergenerational transmission of traumatic stress and relational disruption. The same study reported that there are only three child and adolescent psychiatrists to serve Cambodia’s population of 16 million, highlighting the immense resource gap.
Sociocultural and Collective Transmission
Entire communities remember. In Rwanda, researchers have noted that collective trauma fractures the social “centre,” replacing trust with suspicion and connection with silence. Many learned to survive through resilience marked by silence rather than expression.
In the United States, Indigenous communities have experienced historical trauma—the cumulative emotional and psychological wounding across generations resulting from massive group trauma. Native Americans endure the long legacy of colonial subjugation, including forced relocation, federal Indian boarding schools designed to enact cultural genocide, and ongoing systemic discrimination. Indigenous veterans of the Vietnam era have the highest lifetime PTSD rates of any ethnoracial group, and Native women are twice as likely as Native men to develop lifetime PTSD.
One elderly Aaniiih‑Gros Ventre woman blinded her grandson with a sewing awl rather than allow him to be taken to a boarding school—a desperate act of love that nevertheless passed on trauma. As the community’s lived experience shows, the boarding school system marred survivors, who then wounded their own families. These realities are not unique but are shared across hundreds of Indigenous communities.
Case Examples Across Contexts
The Holocaust and post‑memory: One third‑generation Holocaust survivor described how her parents’ accounts of the war were “more vibrant and more vivid in my memories than moments I recall from my own childhood.” Marianne Hirsch coined the term “post‑memory” to describe this phenomenon, where descendants feel the memories as if they were their own. A 2025 epigenetic study of 371 third‑ and fourth‑generation Holocaust descendants found a dual pattern: stronger activation of the oxytocin system (enhancing social bonding) alongside heightened HPA axis reactivity (increasing stress vulnerability). The descendants showed no elevated psychopathology, suggesting that inherited trauma can also produce adaptive resilience.
Ukraine’s layered genocides: Professor Larysa Zasiekina, a clinical psychologist at the University of Exeter, has shown that many Ukrainian families live under the shadow of “genocide twice over”—shaped by both the Holodomor (a man‑made famine targeting ethnic Ukrainians) and the Holocaust. Her research examines how previous family histories of genocidal trauma affect adolescents exposed to the current Russian invasion, with effects reaching fifth‑generation descendants.
Gaza and the biological scarring of in‑utero exposure: The unfolding violence in Gaza has raised urgent concerns about epigenetic inheritance. Thousands of pregnant women are exposed to severe trauma, and researchers warn that Gaza’s pregnant women may pass stress‑related genetic marks to their babies, shaping future health. Preventive strategies must prioritise the protection of pregnant women from stress and malnutrition, recognising this as a key determinant of long‑term community health.
Community‑Level Effects
Collective Trauma and Social Cohesion
Collective trauma refers to the psychological and relational harm experienced by entire communities following genocide, war, or forced displacement. Collective trauma disrupts trust, fractures social bonds, and erodes shared meaning, resulting in a loss of the psychological and cultural “centre.” Many individuals live in prolonged states of hyperarousal or emotional shutdown long after the immediate threat has passed.
Yet collective victimhood does not always destroy communities. A nationally representative survey from Sri Lanka and the Occupied Palestinian Territory found that individuals with broader knowledge of diverse conflict experiences exhibit stronger attachment to their local communities—but only when they believe that knowledge can be openly shared. Conversely, where diverse conflict experiences are seen as unspeakable, community cohesion is lower. This finding highlights the importance of creating safe spaces for open dialogue about the full range of conflict experiences.
Economic and Social Costs
The community‑level costs of intergenerational trauma are staggering. Mental disorders are the leading cause of health issues globally, yet up to 90 percent of people with common and severe disorders in low‑income countries receive no treatment. In Myanmar, compounded impacts of civil war, displacement, and chronic underdevelopment have left communities with critical unmet mental health needs. Where professional mental healthcare remains out of reach, community‑based psychosocial interventions offer a promising alternative, and a randomised study found that group skills interventions improved social cohesion and shifted expectations surrounding local governance.
The economic burden of untreated trauma includes lost productivity, increased healthcare costs, and the intergenerational reproduction of poverty. When survivors cannot work effectively, when children struggle in school, and when families fragment, the entire community pays a price that compounds across decades.
Interventions and Pathways to Healing
A growing evidence base demonstrates that community‑based interventions can effectively reduce collective trauma. A meta‑analysis of 47 empirical studies in Middle Eastern conflict zones found a significant impact on PTSD symptoms, with a substantial effect size. The most effective strategies were community psychosocial support programmes, followed by collective narrative therapy and family‑based rehabilitation. Longer programmes (at least six months) and active engagement of local leaders were critical determinants of success.
In Gaza, the Sourire program—a community‑based psychosocial intervention for school‑aged children—led to reduced agitation and improved emotional expression, with parents highlighting the importance of support networks in strengthening family mental health. In Colombia, a community‑based psychosocial support intervention facilitated by nonspecialist community members reduced symptoms of depression, anxiety, and PTSD when delivered in‑person. In the post‑genocide context in Rwanda, culturally grounded group processes serve as vital “containers” for survival, meaning‑making, and hope.
Successful interventions share several common characteristics:
- Culturally grounded frameworks: The Ubuntu Center for Peace integrates Western group analytic theory with Rwandan communal metaphors, creating space for emotional holding and relational repair.
- Task‑shifting to non‑specialists: In Myanmar, volunteer community leaders—teachers, farmers, village chiefs—provide essential psychosocial support with technical assistance from NGOs.
- Acknowledgment and truth‑telling: Indigenous oral history and truth‑telling work create conditions for social healing, allowing communities to recalibrate power dynamics and demonstrate cultural humility.
- Preventive prenatal support: Given the epigenetic effects of prenatal stress, protecting pregnant women in conflict zones is a public health priority with multigenerational payoffs.
Challenges and Limitations
Despite these promising approaches, significant obstacles remain. Mental health services are grossly underfunded in conflict‑affected regions. In Cambodia, there are only three child psychiatrists for 16 million people. Stigma prevents many from seeking care, and in some settings, survivors turn to alcohol to cope, perpetuating cycles of secondary traumatisation within families.
The scientific study of transgenerational inheritance is still young, and as one systematic review noted, clear evidence for transgenerational inheritance is still inconclusive, underscoring the need for more thorough and longitudinal studies. Moreover, most research has focused on biological and psychological mechanisms, with less attention to structural factors such as poverty, discrimination, and political exclusion that mediate and moderate transmission.
Conclusion
The intergenerational and community‑level consequences of conflict trauma are not abstract academic concerns. They are lived realities for millions of people across the globe—from the grandchildren of Holocaust survivors in Europe to the children of Khmer Rouge survivors in Cambodia, from Indigenous communities in North America to third‑generation refugees from the Rwandan genocide, from internally displaced families in Ukraine to displaced Palestinians.
Trauma is not a fixed inheritance but a dynamic process shaped by biology, family interaction, community narrative, and structural conditions. Crucially, the same plasticity that allows trauma to be transmitted also allows healing to be cultivated. Interventions that address parenting styles, open up safe spaces for dialogue, destigmatise mental health care, and protect pregnant women from stress can break cycles of transmission and foster resilience.
The hidden wound of intergenerational trauma will not heal on its own. It requires investment, acknowledgment, and an unwavering commitment to ensuring that the children of war are not defined by the violence that came before them—but rather by the possibility of a future not yet written.
Explore more insights on trauma, recovery, and humanitarian action at Centre for Elites : Measures Against Conflicts: Humanitarian Aid — understanding the limits and possibilities of humanitarian intervention — and Agenda‑Setting in Humanitarian Affairs — how global priorities shape responses to intergenerational trauma.
For further information, consult the International Society for Traumatic Stress Studies, the World Health Organization’s mhGAP Humanitarian Intervention Guide, the UNHCR Operational Guidance on MHPSS, the Interpeace research programme on intergenerational trauma in Rwanda, and the International Center for Multigenerational Legacies of Trauma (ICMGLT).
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