DMDD encompasses severe temper outbursts that occur, on average, three+ times per week. In addition, the child’s mood between outbursts must be consistently angry or irritable. For diagnosis of DMDD, a child must experience this pattern of frequent outbursts, plus consistent anger or irritability between outbursts, for 12 or more months. During this 12-month period, the child must show symptoms consistently, meaning that he does not experience a break of three or more months without symptoms of DMDD. The diagnosis of DMDD should not be made before age 6 or after age 18, and the onset of symptoms typically takes place before age 10.
Medication, psychotherapy and a combination of the two may be used as treatments.