Researchers have documented elevated cortisol levels in the hair samples of Ukrainian refugees, providing biological evidence of chronic stress caused by Russia’s invasion, according to a new study highlighted in Science News. The findings offer quantitative support for the psychological toll of war displacement, with cortisol concentrations 2-3 times higher than control groups.
The study analyzed 1cm hair segments from 150 refugees in Poland and Germany, representing approximately one month of cortisol accumulation. ‘Hair cortisol is particularly valuable for measuring sustained stress because it captures hormonal activity over time rather than momentary spikes,’ explained a neuroscientist familiar with the research who requested anonymity as the study undergoes peer review.
Ukrainian displacement now constitutes Europe’s largest refugee crisis since WWII, with UNHCR reporting 6.3 million externally displaced persons as of March 2024. Previous mental health surveys by WHO found 30% of refugees met criteria for anxiety disorders, but biomarker studies remained scarce until now.
Medical analysts suggest these findings could influence humanitarian aid policies. ‘Objective biomarkers help overcome reporting biases in mental health assessments,’ noted a WHO official speaking on background. The research team plans to expand sampling to include refugees in other host countries and track longitudinal changes.