Disruptive mood deregulation disorder is a mental disorder found in a child or an adolescent in which there is persistent display of severe temper outbursts (verbal or behavioural), on average, three or more times per week, Outbursts and tantrums that have been ongoing for at least 12 months, Chronically irritable or angry mood most of the day, nearly every day, Trouble functioning due to irritability in more than one place (at home, at school, and with peers)