Intermittent explosive disorder (IED) is a behavioural disorder characterized by extreme expressions of anger, often to the point of uncontrollable rage, which are disproportionate to the situation at hand. Individuals with IED have brief outbursts with a variety of bodily symptoms (sweating, chest tightness, twitching, palpitations) during which they may harm others and their possessions or themselves. The violent acts might be accompanied by a sensation of relief or pleasure, but later on the individuals will often feel remorse, regret or embarrassment.