Can trauma be inherited genetically?

Question

Accepted Answer

The evidence strongly supports that trauma can alter gene expression through epigenetic mechanisms, and these epigenetic changes can be transmitted to biological offspring — creating inherited stress sensitivities, emotional regulatory patterns, and physiological responses to threat that have their origins in ancestors' experiences rather than one's own. The clearest human evidence comes from Dr. Rachel Yehuda's research at Mount Sinai. She found that children of Holocaust survivors had lower baseline cortisol — a marker of heightened stress sensitivity — not because of their own trauma history, but apparently because of changes in the epigenetic regulation of the cortisol system inherited from their parents. Animal research provides mechanistic support. Studies in mice have shown that fear conditioning (training mice to fear specific odors) produces measurable epigenetic changes in olfactory receptor genes — and offspring of conditioned mice showed heightened fear responses to the same odor without having been conditioned themselves. Dr. Mark Wolynn, who has worked extensively with inherited family trauma, documents cases where clients present with symptoms — phobias, inexplicable anxiety, somatic patterns — that match exactly the experiences of parents, grandparents, or ancestors. The body appears to carry the history of the lineage. This does not mean inherited trauma patterns are permanent or beyond healing. Epigenetic marks are, in principle, reversible. Research suggests that healing practices — especially those that address the nervous system, regulate cortisol, and create new patterns of safety — may alter epigenetic expression over time.