From Roots to Reality: How Trauma Can Echo Through Generations

A few years ago, my sister messaged me after reading one of my articles about how our ancestors coped with anxiety and stress.

She had been reading about generational trauma and asked me something that immediately caught my attention as a genealogist.

Can trauma actually change our DNA and affect later generations?

We already know our ancestors gave us DNA. We also inherit family traditions, stories, attitudes, habits, and ways of dealing with the world.

But can their traumatic experiences affect us too?

The short answer is yes: trauma in one generation can affect later generations.

How that happens is where things get interesting.

What Is Generational Trauma?

Generational trauma, also called intergenerational trauma, describes the effects of trauma that appear in later generations of a family.

Researchers have studied families affected by war, genocide, displacement, abuse, and other severe or prolonged trauma.

This doesn’t mean that a traumatic memory somehow gets passed directly from a parent to a child.

There are much more familiar ways trauma can travel through a family.

Someone who has lived through severe trauma may have difficulty feeling safe, trusting others, handling stress, or talking about painful experiences. Those responses can affect relationships and parenting. Children grow up learning from the people around them, including what is said and what is never discussed.

There may also be biological effects of trauma. That’s where epigenetics comes in.

Does Trauma Change Our DNA?

Not exactly.

Trauma does not rewrite the DNA sequence you inherited from your parents.

Epigenetics deals with changes in how genes are regulated without changing the underlying DNA sequence.

Epigenetics doesn’t rewrite your DNA. It’s more like adding notes that tell the body which instructions to pay attention to and when.

Stress and trauma have been associated with epigenetic changes in people who experience them. Researchers have also found some biological differences in the children of trauma survivors.

The question is whether trauma-related epigenetic changes themselves can actually be inherited by later generations.

In animals, researchers have found convincing evidence that some effects can be passed across generations.

In humans, we don’t know yet.

Human families are a lot messier than laboratory experiments. Parents and children don’t just share biology. They may share a home, culture, financial circumstances, relationships, food, beliefs, habits, and ways of responding to stress. Researchers can’t easily separate one influence from another. Current reviews therefore caution that inherited epigenetic changes caused by life experiences have not been proven in humans.

So my sister wasn’t entirely wrong when she said trauma could affect our DNA.

The more accurate answer is that trauma may affect how some genes are regulated, but we cannot say that an ancestor’s trauma rewrote their DNA and that we inherited those changes.

Families Don’t Need DNA to Pass Down Patterns

This is the part that fascinates me as a genealogist.

Imagine a child growing up during the Great Depression.

Food is scarce. Money disappears. Nothing is wasted because the family cannot afford to waste anything.

That child becomes an adult and eventually raises children during much better times.

But the pantry is always full.

Leftovers are never thrown away.

Money is saved whenever possible.

Those children may carry some of those habits into their own homes. Their children may learn them too.

Three generations later, a behavior can have roots in an event the youngest generation never experienced.

No genetic explanation is necessary.

Families pass along ways of coping with fear, grief, money, food, relationships, conflict, and uncertainty simply by living together.

That doesn’t mean every family habit is the result of trauma. It means our families help shape how we understand and respond to the world.

This Is Where Genealogy Can Help

Genealogy cannot diagnose generational trauma.

Looking at a family tree and finding several deaths, a war, or a difficult childhood doesn’t allow us to explain the behavior of people who came afterward.

What genealogy can give us is context.

We might discover that a family lost several children within a few years. An ancestor survived a war. A family was forced from its home. A parent died young. Generations lived in poverty. Someone experienced abuse, discrimination, institutionalization, or a serious illness.

Those discoveries can change the way we understand a family’s history.

They can also make us ask different questions.

Was money always a source of fear in this family?

How did they deal with grief?

Were difficult subjects discussed or avoided?

Did family members tend to stay close together?

What stories were repeated from generation to generation?

What wasn’t talked about at all?

Those questions don’t diagnose anyone.

They help us understand the world our families lived in.

We Inherit Strengths Too

There’s another side of generational trauma that can get lost in the discussion.

Our ancestors didn’t pass down only hardship.

They survived it.

People rebuilt after wars. They crossed oceans. They raised children after losing spouses. They started over after losing homes, jobs, and communities.

Families developed ways of coping and caring for one another.

Researchers studying trauma across generations also look at resilience, including the relationships and circumstances that can protect people from some of trauma’s effects. Recent research emphasizes that supportive caregiving and social environments can make a difference.

That belongs in our family histories too.

Understanding Without Assuming

This may be the most important lesson for genealogists.

We can document what happened.

We cannot always know what it did to someone.

If a family lost three children within five years, we can document those deaths.

We may even find letters, diaries, court records, or newspaper accounts that tell us something about how the family responded.

But without evidence, we shouldn’t diagnose an ancestor with depression, PTSD, or another psychological condition. And we certainly can’t draw a straight line from an event in 1880 to someone’s behavior in 2026.

We can say:

This family experienced repeated loss.

We cannot automatically say:

This loss caused a particular behavior three generations later.

That’s a big difference.

And it’s exactly the kind of distinction we already make in good genealogy.

Our Ancestors Gave Us More Than DNA

When I first wrote about generational trauma, I thought the science was more settled than it actually was.

I understood it as trauma causing epigenetic changes that could then be inherited by later generations.

Today, I’d explain it differently.

We have good evidence that trauma can affect the person who experiences it, including the body’s response to stress. We also know that the effects of trauma can appear in later generations through family relationships, learned behaviors, circumstances, and possibly biological pathways. What scientists have not established is that trauma-induced epigenetic changes are routinely inherited by humans.

And that’s okay.

We don’t need a genetic explanation for our ancestors’ lives to matter.

Genealogy gives us something enormously valuable on its own: context.

It tells us what our families lived through.

It helps us see patterns we might otherwise miss.

And occasionally, understanding where a pattern began can help us decide whether it’s something we want to carry forward.

Our ancestors gave us DNA.

But they also gave us stories, traditions, habits, fears, strengths, and ways of navigating the world.

Some are worth keeping.

Others can end with us.

Sources:
Yehuda & Lehrner, Intergenerational Transmission of Trauma Effects

2026 Review: Epigenetic Changes Associated With Multi-Generational Trauma