Irritability is common in early childhood and for many children, it reduces over time as they develop better frustration tolerance, language, emotional regulation, and social understanding. However, when irritability remains high across early childhood, it may signal increased vulnerability to later mental health difficulties. Srinivasan et al. (2024) examined whether changes in irritability between ages 3 and 7 were associated with depressive symptoms and self-harm during adolescence. Using data from the UK Millennium Cohort Study, the authors found that children whose irritability did not decline as expected during early childhood were more likely to report higher depressive symptoms and self-harm in adolescence. The paper is important because it shifts attention from irritability as a temporary behavioural issue to irritability as a possible early marker of later emotional risk. It also has relevance for young people with neurodevelopmental difficulties, including ADHD, where irritability is common and may complicate the recognition of emerging depression.
Why irritability matters
Irritability can be defined as an increased tendency to become angry in response to frustration or blocked goals. In young children, some irritability is developmentally expected. Preschool children are still learning how to tolerate disappointment, wait, share, regulate emotions, and express distress verbally. However, irritability also exists on a continuum, at higher levels, when persistent and impairing, it is associated with later mental health difficulties. Previous research has linked childhood irritability with later depression, anxiety, disruptive behaviour, and suicidality (Brotman et al., 2017; Stringaris et al., 2018; Vidal-Ribas et al., 2016). Srinivasan et al. (2024) focus on an important developmental question: is it simply irritability at one point in time that matters, or is the developmental pattern of irritability more informative? Their central hypothesis was that children whose irritability remains high between ages 3 and 7, rather than declining in line with normative development, would be at increased risk of adolescent depressive symptoms and self-harm.
The study
The authors used data from the Millennium Cohort Study, a large, nationally representative UK birth cohort. Childhood irritability was measured at ages 3, 5, and 7 using four items drawn from the Children’s Social Behaviour Questionnaire and the Strengths and Difficulties Questionnaire. At age 14, young people reported depressive symptoms using the Short Mood and Feelings Questionnaire and self-harm using a single self-report item. The authors looked at whether irritability measured separately at ages 3, 5, and 7 was associated with depression and self-harm at age 14. Furthermore, they examined whether change in irritability between ages 3 and 7 predicted these adolescent outcomes. A single high score in toddlerhood or early childhood may reflect a temporary developmental phase. By contrast, irritability that does not reduce across early childhood may indicate a more persistent pattern of emotional dysregulation.
Main findings
The findings were clear. Irritability at ages 5 and 7 was associated with higher depressive symptoms and self-harm at age 14. By contrast, irritability at age 3 was not associated with later depressive symptoms or self-harm after adjustment for confounders. Most importantly, children whose irritability remained high between ages 3 and 7 were more likely to report depressive symptoms and self-harm at age 14. This association remained after adjustment for child sex, ethnicity, family socioeconomic factors, maternal depression, child cognitive development, and early child emotional, peer, hyperactivity, and conduct problems. The association was not simply explained by early hyperactivity, conduct problems, family disadvantage, or maternal depression. Persistent irritability itself appeared to carry information about later adolescent risk. This does not prove causality and the authors are careful to note that the study was observational and that residual confounding, including genetic and environmental factors, cannot be ruled out. However, the findings suggest that the developmental course of irritability may be clinically meaningful.
Why age 5 to 7 may matter
One of the most interesting aspects of the paper is the contrast between age 3 irritability and irritability at ages 5 and 7. Irritability at age 3 was not independently associated with adolescent depression or self-harm, potentially due to irritability being more common and developmentally normative at age 3. By ages 5 and 7, however, most children are expected to have developed greater emotional regulation, frustration tolerance, and capacity to manage social and educational demands. Irritability that remains elevated at this stage may therefore be more informative. This developmental perspective is clinically useful, since it suggests that clinicians and services should not treat all early irritability as equally concerning. Instead, persistence and developmental context matter. A young child who is irritable at age 3 but improves over time may follow a different pathway from a child whose irritability remains high into the early school years.
Possible mechanisms
Srinivasan et al. (2024) discuss several possible mechanisms that could explain the association between persistent irritability and later depression or self-harm. One possibility is emotion regulation. Children with persistent irritability may have greater difficulty tolerating frustration and managing negative affect. Over time, this may increase vulnerability to low mood, withdrawal, conflict, or maladaptive coping strategies. A second possibility involves social experiences. Irritable children may encounter more negative interactions with peers, parents, or teachers. They may be more likely to experience conflict, rejection, or social isolation, all of which can contribute to later depression. A third possibility is avoidance. As children grow older and social and academic demands increase, persistent irritability may lead them to avoid challenging situations. This could reduce opportunities for mastery, positive reinforcement, and peer connection. A fourth possibility is shared liability. Irritability and later depression may be different developmental expressions of an underlying susceptibility to negative affect. In this account, irritability is not necessarily causing later depression but may be an early manifestation of broader emotional vulnerability. The authors also note that environmental experiences such as maltreatment, bullying, and parenting factors may influence both the persistence of irritability and later mental health outcomes. These pathways are likely to be complex and bidirectional.
Relevance to ADHD and neurodevelopmental presentations
Irritability, emotional dysregulation, impulsivity, peer problems, sleep difficulties, and frustration intolerance are common in children with ADHD. These difficulties may complicate the recognition of emerging depression. In clinical practice, irritability in a child with ADHD may be interpreted as part of ADHD itself, as oppositional behaviour, or as a response to school or family stress. Those explanations may sometimes be accurate, but the Srinivasan et al. study suggests that persistent irritability deserves careful attention as a possible marker of later emotional risk. This is especially relevant when thinking about co-occurring ADHD and depression. Depression in young people with ADHD may not always present as obvious sadness. It may appear through irritability, low frustration tolerance, loss of confidence, social withdrawal, low self-esteem, or escalating self-harm risk. The paper therefore supports a developmental approach: clinicians should ask not only whether a child is irritable now, but whether irritability is persistent, impairing, and changing over time.
Implications for prevention and intervention
The findings support the idea that early childhood may be an important window for prevention. If persistent irritability between ages 3 and 7 is associated with later depressive symptoms and self-harm, then early support for emotion regulation and parent-child interaction may have long-term value. Srinivasan et al. (2024) suggest that parent management training may be particularly relevant in early childhood. Interventions for irritability often include parent management approaches and cognitive behavioural components (Stringaris et al., 2018; Sukhodolsky et al., 2016). For younger children, parent-focused interventions may be especially appropriate because parents play a central role in helping children regulate frustration, manage routines, and respond to emotional escalation.
Conclusion
Srinivasan et al. (2024) show that irritability that remains high between ages 3 and 7 is associated with higher depressive symptoms and self-harm at age 14. The study suggests that the developmental course of irritability may be more informative than a single early snapshot. For clinicians, the message is practical: Irritability in early childhood should not automatically be pathologised, but persistent irritability into the early school years deserves attention. It may signal difficulties in emotion regulation, social functioning, or broader vulnerability to later mood problems. For services, the findings point toward prevention. Supporting parents and children with persistent irritability in early childhood may be one route to reducing later depression and self-harm risk. For young people with ADHD and neurodevelopmental difficulties, where irritability is often part of the clinical picture, the study reinforces the importance of monitoring mood, self-esteem, and self-harm risk over time.
Where next?
Join us on 15 September for a fantastic event on ‘ADHD and Depression‘ with Professor Sinead Rhodes, Dr. Olga Eyre, and Dr. Ramya Srinivasan.
This ACAMH Expert Half-Day explores the increasingly recognised link between ADHD and depression in children and young people. As demand on services grows and presentations become more complex, understanding how these conditions interact is becoming ever more important. This three-hour online session will bring together insights on co-occurrence, epidemiology, and treatment to support clearer assessment and more effective care. The programme offers a focused opportunity to engage with a highly relevant and evolving area of practice.
References
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- Stringaris, A., Vidal-Ribas, P., Brotman, M. A., & Leibenluft, E. (2018). Practitioner review: Definition, recognition, and treatment challenges of irritability in young people. Journal of Child Psychology and Psychiatry, 59(7), 721–739. https://doi.org/10.1111/jcpp.12823
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