**Cortisol** is the primary glucocorticoid hormone in humans, secreted by the adrenal glands under the control of the HPA axis. It serves multiple functions: mobilizing energy in response to threats, regulating glucose metabolism, modulating the immune system, and participating in the sleep-wake cycle (following a circadian pattern: peak in the morning, minimum at night).
In the context of trauma, cortisol becomes a key biological marker. **A paradoxical finding has been documented**: patients with chronic PTSD do not exhibit elevated cortisol as might be expected from a sustained stress response; on the contrary, they show **decreased basal cortisol** and an altered feedback response. Yehuda and colleagues documented this pattern in both Holocaust survivors with PTSD and —notably— in their directly untraumatized children.
Beyond the laboratory, cortisol alterations manifest clinically as hypervigilance, difficulty resting, sleep problems, inexplicable fatigue, and vulnerability to infections. The body has its own indicators, and cortisol is one of the most measurable.
Citing cortisol in the context of the systemic approach allows us to anchor subjective experiences of transgenerational stress in a biochemical variable that can be measured in saliva, blood, or hair.
Evidence and Contemporary Voices
Research in the neuroendocrinology of trauma confirms alterations in basal cortisol levels and stress response in trauma victims and their descendants. Yehuda et al. (2000) demonstrated that children of Holocaust survivors exhibit lower basal cortisol levels and hyporeactivity to stress compared to controls, suggesting transgenerational transmission via epigenetic and environmental mechanisms. Longitudinal studies at the Mount Sinai School of Medicine have replicated these findings in populations with childhood trauma, linking hypocortisolism with chronic PTSD symptoms (Yehuda et al., 2016). In animal models, Mansuy and colleagues at the University of Zurich have shown that early maternal stress induces epigenetic changes in HPA axis genes, transmitted to F2 offspring, with reduced expression of glucocorticoid receptors (Franklin et al., 2010). Van der Kolk (2014) integrates these clinical data, highlighting how cortisol dysregulation perpetuates vulnerability to trauma in somatic therapy. Meta-analyses confirm a higher risk of affective disorders in descendants of traumatized individuals, mediated by cortisol (Behrenke et al., 2021).
Verifiable Citations
- "Low cortisol levels in Holocaust survivors and their offspring" — Rachel Yehuda, Low cortisol and hypocortisolemia revealed by dexamethasone suppression test in combat veterans with PTSD (2000).
- "Transgenerational effects of maternal trauma in mice" — Isabelle M. Mansuy, Epigenetic mechanisms of perinatal stress (2010).
Researchers and Experts
- Rachel Yehuda — Mount Sinai School of Medicine — neuroendocrinology of transgenerational trauma
- Isabelle M. Mansuy — University of Zurich — epigenetics of intergenerational stress
- Bessel van der Kolk — Boston University — HPA axis dysregulation in PTSD
Auditable Sources
Additional research generated by consulting academic sources (Perplexity Sonar Pro). Citations and URLs are the responsibility of their original source; verify before formal citation.
Bibliography
- Influences of maternal and paternal PTSD on epigenetic regulation of the glucocorticoid receptor gene in Holocaust survivor offspring — Rachel Yehuda et al.. American Journal of Psychiatry, 171(8), 872-880, 2014.
- Holocaust Exposure Induced Intergenerational Effects on FKBP5 Methylation — Rachel Yehuda et al.. Biological Psychiatry, 80(5), 372-380, 2016.
- The Body Keeps the Score — Bessel van der Kolk. Eleftheria, 2015.
These books are in the reference library that nourishes Constelando el Origen.
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Related terms
HPA axis (hypothalamic-pituitary-adrenal)
Central neuroendocrine system for stress response. Connects the brain and adrenal glands via cortisol. Its dysregulation is the biological correlate of chronic trauma.
See fact sheetFKBP5 (stress gene)
Gene that regulates the sensitivity of the glucocorticoid receptor to cortisol. Its epigenetic modifications are one of the central findings in the transgenerational transmission of trauma.
See fact sheetEpigenetics
The study of changes in gene expression that do NOT alter the DNA sequence, are heritable, and can be activated by life experiences—including trauma.
See fact sheetYehuda's Studies on Holocaust Survivors
Rachel Yehuda's research program at Mount Sinai that documented epigenetic, hormonal, and HPA axis alterations in Holocaust survivors and their descendants.
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