Most common among Behavioural Disorders are:
But there others like:
and a lot many more. The list as you can see, is a long one. Such abnormal behaviour is so annoying and at times dangerous to self and others. It is even harder to manage when they are kids as the case taking will be trickier.
But with patience and professionalism, a proper diagnosis is possible in most cases. Even some food allergies or accidental substance use may manifest as abnormal behaviour in children. So, it is always important to get it right before starting the treatment.