Question 1

A 32-year-old man is referred for evaluation after a road-rage incident in which he followed another driver, got out of his car, and pounded on the other car's hood. Over the past year, he has also punched a hole in a wall during a minor argument with his wife, shoved a kitchen chair hard enough to break it after his child spilled juice, and thrown his phone across a room after a frustrating call at work. Between these episodes, his wife describes him as generally even-tempered — not chronically angry or irritable. He is not using alcohol or drugs around the time of these outbursts. He has no history of mania, conduct problems in childhood, or legal trouble beyond the road-rage incident. He expresses genuine embarrassment about each episode. What is the most likely diagnosis?

Accepted Answer

This presentation is consistent with IED. He has recurrent impulsive aggressive outbursts (at least 3 involving property damage in 12 months) that are grossly disproportionate to the triggers. The aggression is not premeditated or goal-directed. His between-episode baseline is even-tempered, not chronically irritable. He has no substance involvement around the outbursts and no episodic mood features. Antisocial personality disorder (A) does not fit — there is no history of conduct disorder before age 15, no broader pattern of deceitfulness, recklessness, or disregard for others' rights, and he demonstrates genuine remorse. Bipolar II (C) does not fit — there are no discrete mood episodes with hypomanic features (decreased need for sleep, grandiosity, pressured speech, increased goal-directed activity). Borderline personality disorder (D) does not fit — the outbursts are not embedded in a pattern of abandonment sensitivity, identity disturbance, chronic emptiness, or relationship instability.

Question 2

A 13-year-old boy has had three episodes in the past 10 months in which he smashed household objects during minor arguments — he broke a television remote after being told to do homework, cracked a door frame by slamming it after an argument about screen time, and threw a plate against the wall after his sibling changed the channel. Between these episodes his parents describe him as a "normal kid" — he has friends, does reasonably well in school, and is not angry or irritable most of the time. He does not steal, lie for gain, hurt animals, or violate rules beyond typical adolescent limit-testing. He has no history of elevated mood, decreased need for sleep, or grandiosity. He has been assessed for ADHD and does not meet criteria. Which diagnosis is most likely?

Accepted Answer

This presentation is consistent with IED. He has 3 severe outbursts involving property destruction within 12 months. The outbursts are impulsive and disproportionate to the provocation. His between-episode baseline is unremarkable — he is not chronically irritable. Conduct disorder (A) does not fit — there is no pattern of rights violations (no theft, deceitfulness, cruelty to animals, or serious rule violations). The aggression is reactive and impulsive, not proactive or instrumental. DMDD (C) does not fit — DMDD requires persistently irritable or angry mood between outbursts most of the day, nearly every day, for at least 12 months, with onset before age 10. His parents describe him as a "normal kid" between episodes. ODD (D) does not fit — there is no chronic pattern of argumentative/defiant behavior, vindictiveness, or hostility toward authority figures. The outbursts are the clinical problem, not a broader oppositional pattern.

Question 3

A 9-year-old boy is brought in by his parents because of severe outbursts occurring 4-5 times per week for the past 18 months. He screams, throws objects, and has hit his younger brother multiple times. His teachers report the same pattern at school — he has been suspended twice for hitting classmates. Between outbursts, his mother says he is "angry all the time — even first thing in the morning before anything has happened." His teachers describe walking on eggshells around him. He has never had a period of elevated mood, grandiosity, or decreased need for sleep. The outbursts began around age 7. Which diagnosis is more likely than intermittent explosive disorder?

Accepted Answer

DMDD is the more likely diagnosis. The key discriminator is the between-outburst baseline: this child is persistently irritable and angry most of the day, nearly every day, across both home and school settings, for well over 12 months, with onset before age 10. That chronic irritable baseline is the hallmark of DMDD, not IED. IED involves discrete impulsive outbursts without the same persistent irritable mood between episodes. DMDD and IED cannot be co-diagnosed — DMDD takes precedence. Conduct disorder (B) is not the best fit because the core clinical picture is chronic irritability with outbursts, not a pattern of rights violations (theft, deceit, cruelty, serious rule violations). Bipolar I (C) does not fit — there are no discrete manic episodes with elevated mood, grandiosity, or decreased need for sleep. The irritability is chronic, not episodic. Specific learning disorder (D) could contribute to frustration but does not explain the full clinical picture described.

Question 4

Which of the following features, if present, most strongly argues against a diagnosis of intermittent explosive disorder?

Accepted Answer

Premeditated, instrumental aggression is fundamentally incompatible with the IED diagnosis. IED specifically requires that the aggressive outbursts are impulsive and not premeditated, and that they are not committed to achieve some tangible objective such as money, power, or intimidation. Planned aggression designed to control others points toward conduct disorder, antisocial personality features, or coercive interpersonal violence — not IED. Shame after outbursts (A) is actually consistent with IED — many patients with IED are distressed by their own behavior. Comorbid ADHD (B) does not rule out IED — they can co-occur, though ADHD should be treated thoroughly to determine whether it is driving the aggression. Verbal aggression without physical injury (D) does not argue against IED — Pathway 1 of the diagnostic criteria specifically includes frequent verbal aggression as meeting the outburst threshold.

Question 5

A 29-year-old man with no prior psychiatric history or history of violence is brought to the emergency department after he suddenly attacked a coworker during a meeting. His wife reports that over the past 3 weeks he has had two other episodes of sudden aggressive outbursts at home — both unprovoked and out of character. She says he has also been having headaches, seems confused at times, and has had difficulty finding words. He has no history of substance use, no prior aggressive behavior, and no childhood conduct problems. What is the best next step?

Accepted Answer

New-onset aggression in an adult with no prior history, accompanied by headaches, confusion, and word-finding difficulty, requires medical and neurologic workup before any psychiatric diagnosis is applied. IED diagnostic criteria require that the outbursts are not attributable to another medical condition (e.g., head trauma, intracranial pathology) or to the physiological effects of a substance. This presentation — sudden behavioral change with cognitive symptoms — raises concern for neurologic pathology (mass lesion, TBI, vascular event, infection, or other structural cause) that must be ruled out. Diagnosing IED (A) without medical workup would be premature and potentially dangerous. ASPD (C) cannot be diagnosed — there is no history of conduct disorder before age 15, no pattern of antisocial behavior, and the behavior is new-onset and out of character. Starting medication (D) without a medical workup is inappropriate when neurologic red flags are present.

Intermittent Explosive Disorder

Red Flags & Key Clinical Considerations

Premeditated Aggression Is a Major Clue Against IED

Rule Out Substance and Medical Causes First

Safety Matters More Than Diagnostic Precision

Chronic Irritability Should Make You Reconsider the Formulation

Comorbidity Does Not Automatically Explain Away the Outbursts

Related Medications

References & Further Reading