Among the most at risk, anxiety, depression, social phobia, delinquency, alcohol and drugs use tend to appear or get worse. On the other hand, separation anxiety, specific phobias, ADHD and opposition tend to fade out or disappear.
Manifestations of depression and anxiety become more frequent among girls. Behavioral issues and substance use (alcohol, drugs) become more frequent among boys.
Suicidal ideation and suicide attempts increase beginning at age 12. Suicide is the second cause of death among young Quebecers aged 15 to 19. Ninety per cent of teenagers who complete suicide have a history of mental disorders. Parents and teachers concentrate on behavioral issues and often they do not notice adolescents’ anxious/depressive tendencies.