Intermittent explosive disorder (IED) or Militant episode disorder (MED) is an uncommon disorder of the brain characterized by explosive outbursts of behaviour (throwing, breaking things, inflicting physical harm on others) that is disproportional to the provocation. It is an impulse control disorder. It is sometimes linked to temporal lobe epilepsy. It has also been suggested by studies as the underlying cause of road rage.
Those who do have unprovoked violence associated with the disorder show loss of cells and abnormalities in the left hemisphere of the brain.