(If you feel suicidal or know someone in distress, please reach out to them with kindness and call these numbers of local emergency services, helplines, and mental health NGOs)

Self-injury--behaviours like cutting oneself without the intent to die--may be contagious among teenagers, who are more likely to harm themselves when they know someone who has, say researchers.

The study, published in the journal Acta Psychiatrica Scandinavica, used 2014 data collected from over 1,400 Ontario teenagers between the ages of 14-17.

The team focused on the answers to the question, "Has a friend of yours ever hurt themselves without the intention to die?" A positive response saw the respondent two to three times as likely to answer 'Yes' to the question of whether they have thought about, or done, the same. These results are of concern, especially during the Covid-19 pandemic, because, apart from being a sign of acute distress, non-suicidal self-injury is a predictor of later suicidal behaviour and more widespread.

Dr Colman's study builds on previous research showing teens who are exposed to suicide among their peers are more than twice as likely to demonstrate suicidal behaviour or harbour suicidal thoughts than those who are not exposed.

This sort of communication of ideation and behaviour is a form of contagion, and its spread can be tracked by epidemiologists just as physically communicable diseases are studied. Knowing that suicide is made more likely by knowledge about someone else's suicide, societal measures have been put in place to protect vulnerable populations from exposure

Less obvious are the measures that can slow or protect against socially contagious behaviours among teens, who can be expected to communicate freely among themselves, without referring to guidelines.

"There's a belief that a parent talking to their child about suicide may increase the risk of suicide or self-harm," said Dr Colman.

(This story was published from a syndicated feed. Only the headline and picture has been edited by FIT)