Severe shock due to blow on the head or concussions more likely to increase the long-term suicidal risk of an individual, revealed a new study.
The medical records of more than 235,000 patients who sustained concussions over a 20-year period in Ontario, Canada were analyzed in the Journal of the Canadian Medical Association (CMAJ).
Overall, those who had concussions experienced a three times higher risk of the suicide in the coming years than the general population.
"Weekend concussions were associated with a one-third further increased risk of suicide compared with weekday concussions," said the study.
The average time from concussion to subsequent suicide was nearly six years.
"Given the quick usual resolution of symptoms, physicians may underestimate the adverse effects of concussion and its relevance in a patient's history. Greater attention to the long-term implications of a concussion might save lives because deaths from suicide can be prevented," said study author Donald Redelmeier, senior core scientist at the Institute for Clinical Evaluative Sciences (ICES) and a physician at Sunnybrook Health Sciences Centre, Toronto, Ontario.
The average age of concussion patients was 41, and they tended to be male urban dwellers without any history of suicide attempt, hospitalization or past psychiatric disorder.
In addition to the boost in suicides among those who hurt themselves on the weekend, the study found a "distinctly larger" longtime risk of suicide "among patients after an ankle sprain."
"Suicide is not confined to professional athletes or military veterans," said Michael Fralick, a coauthor and medical trainee at the University of Toronto. Nearly 4,000 lives ended by suicide in Canada in 2010.