Behavioral Problems Linked to Cortisol Levels: Study Finds Intervention Needed as Soon as Behavioral Problems Appear
Feb. 10, 2011 — Cortisol, the so-called stress hormone, seems to behave in contradictory ways in children. Some youngsters with behavioral problems have abnormally high levels of cortisol, while others with identical problems have abnormally low levels. What’s going on?
Researchers at Concordia University and the Centre for Research in Human Development may have resolved the cortisol paradox. In a groundbreaking study published in the journal Hormones and Behavior, they link cortisol levels not simply to behavior problems, but to the length of time individuals have experienced behavior problems.
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Alx Bal 
Since cortisol is a direct outcome of stress, I believe stress is the major factor that leads a perfectly sane kid to act violently.
I would not be surprised! It also leads to major problems in learning and self-esteem. Which can lead to violence…..