Intergenerational trauma

Two names, one idea, different levels of evidence

In research, the phrase is usually intergenerational transmission of trauma: measurable effects in the children of people who lived through severe trauma, such as war, genocide, famine or abuse. In everyday conversation, generational trauma has become a broad way to describe painful family patterns that seem to repeat, from harsh discipline to silence about feelings. The popular phrase is useful for naming something many people sense. It also gets stretched to cover almost any family difficulty, which can blur what the science actually says.

What research supports

Psychiatrist Rachel Yehuda, who studied the adult children of Holocaust survivors, and psychologist Amy Lehrner reviewed the field in World Psychiatry in 2018. Studies have found that offspring of trauma survivors can show differences in stress-hormone (HPA axis) functioning, and some show epigenetic differences linked to a parent’s PTSD. Studies of prenatal exposure, such as the Dutch famine of the 1940s, have also reported differences in offspring.

What is not yet established

The same review is careful: epigenetic inheritance of trauma effects has not been conclusively demonstrated in humans. The strongest evidence for biological transmission through eggs or sperm comes from animal studies. In people, preconception trauma, stress during pregnancy, parenting after birth, genetics, nutrition and shared hardship all overlap. Many studies are small or retrospective. The authors also warn against treating effects of parenting or social environment as if they were biological inheritance.

So when a post says “trauma is stored in your DNA and passed to your kids,” the honest answer is: that is a hypothesis being studied, not a settled fact.

How effects pass down without DNA

• Parenting shaped by survival. A parent who learned hypervigilance in danger may parent with fear or control.
• Silence. Families often avoid talking about what happened, and children feel the weight without the story.
• Emotional unavailability. A depressed or traumatized parent may struggle to attune, a pathway that overlaps with childhood emotional neglect.
• Ongoing conditions. Poverty, displacement and discrimination can continue across generations and compound earlier harm.

Murray Bowen described a related process, the multigenerational transmission of emotional patterns, without needing trauma at all.

An illustrative example

Imagine a family in Hamtramck. A grandfather survived war and displacement and never spoke of it, but flinched at sudden noises and kept emergency cash sewn into his coat. His daughter grew up anxious and strict, convinced the world could collapse at any moment. Her son, now a father himself, notices he panics when his toddler wanders even a few steps. No single gene explains that chain. Fear, silence and protectiveness explain a lot of it.

Breaking the pattern

People who set out to change a family pattern sometimes call themselves a cycle breaker. Useful steps include learning the family story where it is safe to do so, mapping it in a genogram, noticing your own reactions without shame and building new habits of repair with your children. Yehuda and Lehrner note that animal studies show some stress-linked changes can be reversed by enriched environments, a hopeful reminder that inheritance is not destiny.

When to reach out

If family history feels heavy, family therapy can help relatives talk about the past and agree on what they want for the next generation. Individual trauma-informed therapy may help when your own symptoms, such as panic or numbness, are getting in the way.

If you are in crisis, call or text 988 to reach the Suicide & Crisis Lifeline. If anyone at home is hurting you, the National Domestic Violence Hotline is at 1-800-799-7233 (thehotline.org).