"Nobody yet fully understands the causes linking behavioural disorders to specific causes", (Winzer, 2008) but all children with behavioural issues deserve a chance.

Look for symptoms of behavioural disorders on the Better Health/Better Medicine site:  http://www.localhealth.com/article/behavioural-disorders/symptoms

Also, check out information booklets for the public compiled by McMaster University on Mood Problems, Behaviour Problems, Anxiety Problems and Attention Problems in Children and Adolescents:  http://www.knowledge.offordcentre.com/