Irritability and Mood Dysregulation in Youth Populations

Irritability in young people manifests as a heightened proneness to anger, frustration and temper outbursts, often accompanied by persistent negative mood. Historically viewed as a symptom dimension across mood and behavioural disorders, irritability has gained prominence as both a transdiagnostic construct and a potential marker of emerging psychopathology. In childhood and adolescence, chronic irritability may herald later depressive and anxiety disorders, while episodic irritability can signal bipolar or mood‐dysregulation phenotypes. Disruptive Mood Dysregulation Disorder (DMDD) was introduced to capture severe, non-episodic irritability characterised by frequent temper outbursts and a persistently irritable or angry mood between episodes. Across clinical and community samples, irritability correlates with functional impairment in home, school and peer contexts, underscoring its public health importance.

Neurobiological investigations point to altered limbic and prefrontal circuit dynamics in irritable youth, with aberrant amygdala reactivity to emotional faces and diminished regulatory control in anterior cingulate and orbitofrontal regions. Genetic studies further suggest shared heritability with attention-deficit/hyperactivity disorder (ADHD) and mood disorders, with copy number variants contributing to individual differences in irritability presentations. Assessment approaches have evolved to include brief parent- and self-report measures, yet informant discrepancies remain a challenge, reflecting divergent interpretations of observable behaviours versus internal states. Contemporary frameworks emphasise irritability as a dimensional trait with both state-like fluctuations and trait-like stability, calling for early identification and targeted interventions that span pharmacological, behavioural and family-based strategies.

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Irritability and Mood Dysregulation in Youth Populations publication trend

The graph below shows the total number of articles in irritability and mood dysregulation in youth populations across all publications each year (not limited to Nature Index journals).

Technical terms

Irritability: A tendency to experience frequent and intense anger or frustration disproportionate to situational demands.

Disruptive Mood Dysregulation Disorder (DMDD): A paediatric diagnosis marked by severe, recurrent temper outbursts and persistently irritable mood between episodes.

Affective Reactivity Index (ARI): A brief questionnaire assessing frequency, severity and impairment of irritability symptoms in children and adolescents.

Copy Number Variants (CNVs): Genomic micro-deletions or duplications that alter gene dosage and may affect neurodevelopmental trajectories.

Executive Function: Cognitive processes including working memory, inhibitory control and cognitive flexibility essential for emotion regulation and goal-directed behaviour.

References

1. Irritability as a Transdiagnostic Construct Across Childhood and Adolescence: A Systematic Review and Meta-analysis. Clinical Child and Family Psychology Review (2025).
2. The Status of Irritability in Psychiatry: A Conceptual and Quantitative Review. Journal of the American Academy of Child & Adolescent Psychiatry (2016).
3. Elevated amygdala responses to emotional faces in youths with chronic irritability or bipolar disorder. NeuroImage Clinical (2013).
4. Neural correlates of masked and unmasked face emotion processing in youth with severe mood dysregulation. Social Cognitive and Affective Neuroscience (2015).
5. Investigating the genetic underpinnings of early-life irritability. Translational Psychiatry (2017).
6. Irritability in young people with copy number variants associated with neurodevelopmental disorders (ND-CNVs). Translational Psychiatry (2024).
7. Robust caregiver-youth discrepancies in irritability ratings on the affective reactivity index: An investigation of its origins. Journal of Affective Disorders (2023).
8. Executive function in children with disruptive mood dysregulation disorder compared to attention-deficit/hyperactivity disorder and oppositional defiant disorder, and in children with different irritability levels. European Child & Adolescent Psychiatry (2023).