Your Grandmother’s Body Lives in Yours: What Epigenetics Really Says About Intergenerational Trauma
A grounded look at inherited stress, trauma biology, and what can actually change
by Rosa F. Brissos, PhD
Intergenerational trauma is often spoken about as if it were mystical, fixed, or genetically fated.
The actual science is more precise than that.
Epigenetics does not mean trauma rewrites your DNA. What it may help explain is how stress biology, prenatal exposure, attachment, and caregiving patterns can shape what gets carried across generations.
That distinction matters.
Because inherited does not mean irreversible. The honest version comes with a footnote most popular content skips: the two largest systematic reviews of this literature both conclude that the association is real and that the evidence is not yet strong enough to say what it means. The phenomenon is real. The molecular specifics are still being worked out. Both can be true at once — and the woman whose nervous system is doing the work does not need her practitioner to overclaim the data to validate what her body already knows.
There’s a version of this story that travels well.
Trauma lives in your DNA. Your grandmother’s suffering was written into her genes, and those genes were passed to your mother, and your mother passed them to you. You are carrying wounds that are not even yours.
It’s a compelling story. It has the quality of explanation, of depth, of being seen at a level that feels almost sacred.
And it has enough truth in it to be dangerous.
Because the real story — the one the research actually supports — is more interesting and considerably more useful.
What epigenetics actually is
Epigenetics is not about changes to your DNA sequence.
Your genes — the actual code — are not rewritten by experience. Epigenetics studies the molecular switches that regulate whether and how genes are expressed: which genes are active, which are silenced, and to what extent.
These switches are influenced by environment, experience, stress, and development. They can shift over a lifetime.
And yes, some of these regulatory changes may be relevant to how trauma-related effects show up across generations.
But “your trauma is in your genes” is a very different story from “your stress biology was calibrated by your parents’ experience.”
One sounds like a verdict.
The other points somewhere you can actually go.
The genes that keep appearing
If you are not a scientist, here is the simple version: these are not “trauma genes.” They are markers that researchers study to understand how the stress system adapts under pressure.
Across dozens of studies and multiple trauma populations, three genes come up repeatedly.
NR3C1 encodes the glucocorticoid receptor — the protein that allows your cells to receive cortisol’s signal. Methylation changes at this gene affect how stress hormones communicate throughout the body. When stress chemistry is repeatedly altered, NR3C1 methylation is one of the places that change tends to show up.
FKBP5 regulates cortisol receptor sensitivity and is one of the strongest candidate genes for PTSD vulnerability. It may influence whether a person, under a given level of stress, develops post-traumatic symptoms. In some well-known trauma studies, offspring did not show a copy of the parent’s pattern so much as a biological echo — a calibration response to living with a parent who had already been altered.
BDNF — brain-derived neurotrophic factor — is linked to neural plasticity and the brain’s capacity to update itself in response to experience. It is the most context-sensitive of the three, more variable in direction, and more dependent on developmental window and maternal history.
What these genes share is this:
They are markers of how a body has calibrated under pressure.
They are not a verdict on what is possible.
They tell a story about where the stress system has been — not where it has to stay.
What the strongest evidence actually shows
The study most people cite when talking about intergenerational trauma is Yehuda et al.’s Holocaust offspring research: foundational, important, and widely referenced.
It matters.
But it is not the whole picture.
The most interesting recent work is a 2025 study of Syrian refugee families, published in Scientific Reports.[1] Three generations: grandmothers, mothers, children. It compared families where the grandmother was pregnant during the 1980 violence with families where the mother was pregnant during 2011, against a control group never exposed to war.
What it found: 14 methylation sites associated with germline exposure, 21 with direct exposure. Most of them moved in the same direction regardless of how the violence reached the person — which is what you would expect if there is one shared biological response to violence rather than three separate ones. Children exposed prenatally also showed epigenetic age acceleration.
And here is the part I am not going to skip.
48 families. 131 people.
That is small, and the authors say so themselves. Twice. They write that their “small sample size may be insufficient to detect such an effect at statistical significance,” and they list “relatively small sample sizes” as a limitation of the work.[1]
So: this is the first reported intergenerational epigenetic signature of violence. That is genuinely a first. It is also 131 people who gave cheek swabs, and it needs replicating before anybody builds a programme on it.
Both of those are true at the same time. If I told you only the first one, I would be doing the exact thing I am complaining about.
This matters to me because I’m trained as a biochemist and medicinal chemist, and I read these papers.
The gap between what the research shows and what circulates in wellness spaces as “the science of intergenerational trauma” is significant. Two systematic reviews have tried to take stock of this. One went through 72 human studies linking childhood maltreatment to methylation.[2] The other went through 100.[3] Both land in roughly the same place: the association is there, and the research is not yet good enough to tell you what it means. Missing longitudinal data. Studies that cannot be compared with each other. Confounding from genetics, and from exposures that came before the one being measured.
That is not nothing. It is also not a mechanism anyone should be selling.
This isn’t an argument against epigenetics. It’s an argument for precision. The field is real.
The evidence is building.
Some of the recent high-quality work is genuinely compelling.
But the popular narrative has dramatically outpaced what the research actually supports.
And I think you deserve the accurate version, not the one that just sounds better in a caption.
How trauma actually moves between generations
The current evidence points to several main transmission routes, and this is where the science stops being abstract and starts being relevant to your real life.
Preconception biology
Parental physiology — including endocrine and immune states before conception — may influence early developmental conditions. Causal proof in humans is still limited, but the mechanistic plausibility is real, and the research is moving in this direction.
Prenatal stress transmission
This is one of the best-supported biological pathways. Maternal stress hormones cross the placenta. Glucocorticoid, inflammatory, and placental signaling can influence how the developing offspring’s stress system is calibrated before birth. The baby arrives already shaped by its mother’s nervous system before it has ever drawn a breath outside the womb.
Postnatal caregiving and attachment
This is likely the most clinically significant route — and the most actionable. How a parent’s stress system activates and recovers shapes how the child’s stress system is repeatedly activated and resolved. Co-regulation is not a metaphor for warmth. It is a mechanism of transmission. A hypervigilant parent does not pass hypervigilance through genes alone. They pass it through thousands of micro-interactions across years of development.
The nervous system learns from the nervous systems around it.
Cumulative social context
Displacement. Poverty. Ongoing threat. Family instability. Violence. Chronic uncertainty.
Intergenerational trauma is not only a legacy. In many cases, it is also due to continued exposure.
Families that never fully escape the conditions that created the original trauma continue to be shaped by those conditions.
These routes do not operate in sequence.
They compound.
A child whose grandparents fled war, whose mother developed PTSD, and who was raised by a dysregulated caregiver in an unstable environment may be shaped at every level simultaneously: biology, attachment, and social context working together.
What “epigenetic healing” actually means — and what it doesn’t
I want to name something directly because I see it increasingly in this space:
The promise that specific therapeutic work, ceremonies, or programs will “heal your epigenetics” or “rewrite what trauma wrote into your genes.”
The current evidence does not support that framing.
And being honest about that is not a limitation.
It is what makes the actual truth more powerful.
What the research does support is this:
Interventions that change appraisal, improve autonomic regulation, repair attachment patterns, and increase environmental predictability may have downstream effects on stress-system biology over time.
Successful trauma treatment, supportive caregiving, and family-centered approaches have been linked to changes in stress-related methylation patterns.
Therapy is not biology-neutral.
The mechanism is indirect.
You change the system — the biology follows.
That is different from “this ceremony will clean your molecular slate.”
But it is still deeply significant.
The nervous system’s capacity to update, to recalibrate, to learn safety through new experience — that is one of the most hopeful findings in all of neuroscience.
The way I frame it with clients is simple:
Intergenerational trauma is transmitted through stress biology, attachment patterns, and learning environments — not as destiny, but as calibration.
Your nervous system learned its threat settings partly from the environment your parents lived in, and the body they brought to raising you.
That means it can learn new settings from the environment you build now.
That is accurate.
And it is more than enough.
What the work actually changes
If intergenerational transmission happens primarily through postnatal caregiving, prenatal stress, and ongoing social context, then the most powerful interventions target these same pathways.
Regulating your own nervous system changes the autonomic signal you send to the people around you.
Repairing your attachment patterns changes what you model and what you transmit through co-regulation.
Building genuine safety — relational, financial, somatic, environmental — addresses the social-context route directly.
You do not have to heal what your grandmother carried in order to stop carrying it forward.
You have to give your own nervous system enough new experience — enough regulation, enough safe relationship, enough corrective reality — that it begins to update its predictions.
That is the work.
Not dramatic.
Not once.
Not a ceremony that changes everything in a weekend.
Repeated, dosed, embodied experience over time, in a container that is actually safe.
That is what changes the inheritance.
If you want to trace the pattern first
If something in this landed — if you recognized the thread running through what your body does now and what you’ve watched the people before you do — the Intergenerational Pattern Map is a place to begin.
It is a structured reflection tool for tracing stress patterns across three generations:
Not to assign blame.
Not to perform a pop-psychology family-tree exercise.
But to begin to see the shape of what was transmitted — and where you stand in relation to it.
→ Download the free Intergenerational Pattern Map — a structured tool for tracing inherited stress patterns across three generations.
Or, if you are ready to work with the pattern directly:
→ Book The Window — 90 minutes one-to-one, plus a 30-minute follow-up placed inside the two-to-four week period when the nervous system is most open to updating. €222. Focused on intergenerational patterns, regulation, and what you are carrying forward.
Why this matters more than the myth
The seductive version of this conversation says:
“You inherited the wound.”
The more useful version says:
“You inherited a set of stress predictions, attachment patterns, and biological adaptations shaped by what came before you.”
That may sound less cinematic.
It is also far more liberating.
Because if trauma were a fixed sentence written into your genes, there would be very little to do.
But if what was passed down is calibration, then calibration can change.
That is where responsibility returns.
That is where healing becomes practical.
That is where the story stops being about fate and starts becoming about nervous system learning, relationship, safety, and choice.
If this is your work now
If this piece stirred something in you, pay attention to that.
Notice what your body does with closeness.
With rest.
With being seen.
With disappointment.
With safety.
With praise.
With not being needed.
With joy.
That is often where the family pattern reveals itself.
And that is also where healing begins.
Not by blaming your parents for the rest of your natural life.
Not by turning bloodline pain into an identity.
Not by using science to sound sophisticated while nothing actually changes.
But by becoming the person who can feel the pattern, name the pattern, and interrupt the pattern.
That is how lineage shifts.
One regulated choice at a time.
Rosa F. Brissos, PhD is a somatic trauma coach, psychedelic preparation and integration specialist, and breathwork facilitator based in Portugal. She holds a PhD in Organic & Medicinal Chemistry and works at the intersection of neuroscience, somatic practice, and consciousness.
FAQ
Is intergenerational trauma really stored in DNA?
Not in the DNA sequence itself. Epigenetics studies molecular switches that regulate gene expression. Some appear transmissible across generations under specific conditions — but the effect is meaningful, not deterministic. It is not a verdict.
What genes are linked to intergenerational trauma?
The most consistently replicated are NR3C1 (glucocorticoid receptor), FKBP5 (cortisol receptor sensitivity), and BDNF (neural plasticity). These are markers of how a body calibrated under pressure — not a sentence.
Can intergenerational trauma be healed?
Yes. The most actionable transmission routes are postnatal caregiving and the ongoing social environment. Regulating your own nervous system, repairing attachment patterns, and building genuine safety changes what you pass forward.
What does healing intergenerational trauma actually involve?
Usually, not one dramatic breakthrough. More often, it involves repeated embodied work: regulation, attachment repair, better boundaries, safer relationships, and enough lived experience for the body to stop expecting the old world.
References
(1) Mulligan, C. J.; Quinn, E. B.; Hamadmad, D.; Dutton, C. L.; Nevell, L.; Binder, A. M.; Panter-Brick, C.; Dajani, R. Epigenetic Signatures of Intergenerational Exposure to Violence in Three Generations of Syrian Refugees. Sci. Rep. 2025, 15, 5945. DOI: 10.1038/s41598-025-89818-z.
(2) Cecil, C. A. M.; Zhang, Y.; Nolte, T. Childhood Maltreatment and DNA Methylation: A Systematic Review. Neurosci. Biobehav. Rev. 2020, 112, 392–409. DOI: 10.1016/j.neubiorev.2020.02.019.
(3) Parade, S. H.; Huffhines, L.; Daniels, T. E.; Stroud, L. R.; Nugent, N. R.; Tyrka, A. R. A Systematic Review of Childhood Maltreatment and DNA Methylation: Candidate Gene and Epigenome-Wide Approaches. Transl. Psychiatry 2021, 11 (1), 134. DOI: 10.1038/s41398-021-01207-y.
(4) Yehuda, R.; Lehrner, A. Intergenerational Transmission of Trauma Effects: Putative Role of Epigenetic Mechanisms. World Psychiatry 2018, 17 (3), 243–257. DOI: 10.1002/wps.20568.
All four references verified against PubMed and the published papers on 20 September 2026.
