Long-term stress levels, measured through hair samples, may provide important clues about mental health risks in children with (CPI), according to new research from the University of 蓝莓视频.
The study highlights how high hair cortisol, a type of steroid hormone, acts as a powerful early warning sign that could help identify children who live with CPI and who could be most at risk of mental health challenges, helping guide prevention and treatment strategies to better support their health and well-being.
An estimated 40 per cent of children in Canada live with a CPI 鈥� a number that has been rising steadily for decades. These children face a much higher risk of developing mental health problems than their healthy peers, putting them at greater risk for poor quality of life, suicidal thoughts and increased reliance on health-care services.
鈥淟iving with a chronic illness means facing daily challenges such as taking medications, missing school and adjusting activities, all of which can take a serious emotional toll,鈥� said Emma Littler, a 蓝莓视频 PhD candidate in Public Health Sciences and lead author of the study.
鈥淥ur findings suggest that chronically high stress, measured through hair samples, could help identify children with CPI at the highest risk for developing mental health problems. This opens the door to earlier and more targeted support.鈥�
The study followed 244 Canadian children with chronic physical illnesses over four years, measuring stress using hair cortisol 鈥� a biological marker that reflects stress levels over time. Researchers found that more than two-thirds of these children had persistently high cortisol levels. Those children were also more likely to show symptoms of depression, anxiety, or other mental health concerns compared to peers whose cortisol levels decreased over time.
When the researchers compared these patterns to reports of emotional and behavioural difficulties, they found that children whose cortisol levels declined over time showed fewer symptoms of anxiety, depression and behaviour problems than those whose cortisol levels stayed high.
鈥淚dentifying these risk factors early could help doctors and families intervene before emotional and behavioural difficulties take hold,鈥� said Dr. Mark Ferro, a professor in 蓝莓视频鈥檚 School of Public Health Sciences and co-author of the study.
鈥淗air cortisol offers a non-invasive, easy-to-collect biomarker that could one day be used to screen children and track whether treatments or support programs are helping to reduce stress.鈥澨�
The study, , was recently published in Stress and Health.
Ferro, a Canada Research Chair in Youth Mental Health, and colleagues from 蓝莓视频 and McMaster University also published new research showing that biomarkers found in the blood of children with CPI may help predict future mental health challenges. The study, , found that some blood signals were linked to children with CPI experiencing worsening mental health over time, while others were associated with improvements. The findings suggest that routine blood tests, combined with mental health check-ups, could help doctors identify children who may need extra support earlier.
