distuDepression commonly co-occurs with attention-deficit/hyperactivity disorder (ADHD). When this combination occurs is associated with greater clinical complexity and poorer outcomes. Yet depression in young people with ADHD may not always be straightforward to recognise, some symptoms of depression overlap with ADHD, some may be expressed through irritability, sleep problems, or behavioural difficulties, and young people with ADHD may not always report depressive symptoms in the same way as their parents. Williams et al. (2026) investigated how depression symptoms cluster in children with ADHD using data from the Study of ADHD Genes and Environment (SAGE). The authors analysed parent-reported depression symptoms approximately five years after baseline ADHD assessment. They identified three distinct symptom presentations: a low symptoms group, a high symptoms group, and an irritable/poor sleep group. The findings are clinically important because they suggest that depression in ADHD is not a single, uniform presentation. Young people with ADHD and behavioural disorders may be particularly likely to show a more severe depression profile marked by suicidal cognitions and low self-esteem. Those with higher autistic traits may show a presentation characterised by irritability and poor sleep. For clinicians, the findings highlight the need to look beyond broad depression scores and consider how specific symptoms cluster in individual young people.
ADHD and depression: a high-risk combination
ADHD is one of the most common neurodevelopmental disorders in childhood and is associated with difficulties in attention, activity level, impulsivity, self-regulation, and functioning across home, school, and social settings (Thapar & Cooper, 2016). ADHD also commonly co-occurs with other psychiatric difficulties, including depression.) Young people with ADHD have a substantially increased risk of developing depressive disorders compared with the general population. This comorbidity matters because depression in the context of ADHD is associated with more severe clinical outcomes, including earlier onset, longer duration of depressive symptoms, and increased suicide risk (Biederman et al., 2008). Depression symptoms may also help explain the association between ADHD and suicidality (Balazs et al., 2014). The clinical challenge is that depression may be more difficult to detect in young people with ADHD. Symptoms such as restlessness, poor concentration, irritability, sleep problems, and low motivation may be interpreted as part of ADHD, part of oppositional behaviour, or part of general adolescent distress, creating a risk of missing clinically important depressive symptoms.
Why symptom presentation matters
Depression is a heterogeneous condition. Two young people can both meet criteria for depression while sharing few individual symptoms. It can involve low mood, anhedonia, sleep disturbance, appetite changes, fatigue, concentration difficulties, guilt, low self-worth, psychomotor changes, and suicidal thoughts. This variability means that looking only at total symptom scores may obscure clinically meaningful differences between young people. This issue is particularly relevant in ADHD since depression symptoms may overlap with ADHD itself. For example, difficulties concentrating, restlessness, indecisiveness, and irritability may appear in both ADHD and depression. Williams et al. (2026) highlight earlier work showing that depression symptoms are common in young people with ADHD, but that the symptom profile may resemble that seen in the general population while being more frequent overall (Fraser et al., 2018). Therefore, a more nuanced question may be asked: not simply whether young people with ADHD have elevated depression symptoms, but whether there are distinct patterns of depressive symptom presentation within this group.
Study design
Williams et al. (2026) used data from the Study of ADHD Genes and Environment (SAGE), a clinical ADHD sample recruited through Child and Adolescent Mental Health Services and paediatric outpatient clinics in South Wales. At baseline, participants had undergone detailed assessment of ADHD and associated clinical features. Approximately five years later, parents completed the Mood and Feelings Questionnaire to report their child’s depression symptoms. The authors analysed data from young people with ADHD. The mean age at baseline was 10.9 years, and the mean age at depression symptom follow-up was 14.6 years. The study used latent profile analysis to identify whether parent-rated depression symptoms clustered into distinct groups. This approach is useful because it moves beyond average symptom levels. Instead of asking which symptoms are most common overall, latent profile analysis asks whether there are subgroups of young people who show different patterns of symptoms.
Three depression symptom presentations
The authors identified three distinct depression symptom profiles.
The first was a “low symptoms” class, representing 48.5% of the sample. This group had relatively low depressive symptoms overall, although some symptoms that overlap with ADHD, including irritability and concentration difficulties. This finding is clinically important because it suggests that some depression-like symptoms may be common in ADHD even when a broader depressive presentation is not present.
The second was a “high symptoms” class, representing 15.5% of the sample. This group showed high levels of depression symptoms across items, with particularly high scores for suicidal cognitions and low self-esteem. This profile appears to represent a more severe and clinically concerning presentation. The findings are consistent with previous evidence (Diler et al., 2007).
The third was an “irritable/poor sleep” class, representing 36.1% of the sample. This group had high irritability and poor sleep, alongside intermediate levels of other depressive symptoms. This presentation is especially interesting because it may be difficult to interpret clinically. It may represent a particular depressive presentation in ADHD, but it may also reflect broader neurodevelopmental difficulties, given that irritability and sleep problems are common in young people with ADHD and autistic traits (Cortese et al., 2009; Eyre et al., 2019).
Behavioural problems and severe depression symptoms
One of the key findings was that behavioural problems were associated with the high symptoms class. Young people with oppositional defiant disorder or conduct disorder were more likely to be in the high symptoms group compared with the low symptoms group. This matters clinically because behavioural difficulties can sometimes dominate the clinical picture. A young person may be referred because of aggression, defiance, impulsivity, or school disruption, while underlying depressive symptoms receive less attention. Williams et al. (2026) suggest that behavioural disorders may be a marker of more severe depressive symptom presentation in young people with ADHD. The high symptoms group was also characterised by suicidal cognitions and low self-esteem. This does not mean that every young person with ADHD and behavioural difficulties is depressed, but it does suggest that clinicians should actively assess mood, self-worth, and suicidal thoughts when behavioural problems are present.
Irritability, poor sleep, and autistic traits
The irritable/poor sleep class raises a different clinical question. This group did not show the same overall severity as the high symptoms class, but irritability and poor sleep were prominent. Williams et al. (2026) found that higher autistic traits were associated with this profile. This finding is important because irritability and sleep difficulties can sit at the intersection of ADHD, autism, and depression. Irritability is common in ADHD and has been linked to later depression symptoms (Eyre et al., 2019). Sleep problems are also common in ADHD, and sleep difficulties in adolescence are associated with mental health symptoms more broadly (Cortese et al., 2009; Loram et al., 2023). The authors are appropriately cautious in interpreting this group. It is possible that high irritability and poor sleep represent a specific presentation of depression in some young people with ADHD. It is also possible that these symptoms reflect a broader neurodevelopmental phenotype rather than depression itself. Further longitudinal research is needed to understand whether young people in this group are at increased risk of later depressive disorder.
Symptom overlap and diagnostic complexity
A major implication of the paper is that clinicians should be cautious about assuming that depression symptoms in ADHD are always straightforward to interpret. Some symptoms may overlap phenotypically with ADHD, while others may signal a more distinct depressive syndrome. For example, concentration difficulties and restlessness are core features of ADHD but can also appear in depression. Irritability may be part of ADHD-related emotional dysregulation, a feature of depression, a sign of comorbid behavioural difficulties, or part of an autistic/neurodevelopmental profile. Poor sleep may arise from ADHD, anxiety, depression, medication effects, routines, or other factors. This complexity does not mean that depression should be ignored. Rather, it means that assessment should be careful, multi-informant, and symptom-specific. Clinicians may need to look particularly closely at low self-esteem, suicidal cognitions, loss of interest, social withdrawal, persistent sadness, and changes from the young person’s baseline functioning.
Implications for clinical practice
First, young people with ADHD should be routinely assessed for depression symptoms. The elevated risk of depression in this group means that mood symptoms should not be treated as secondary or incidental.
Second, clinicians should pay attention to symptom profiles, not only total scores. A young person with ADHD and high suicidal cognitions or low self-esteem may require urgent and targeted assessment, even if behavioural problems are the most visible presenting concern.
Third, comorbid behavioural disorders deserve careful mood assessment. The association between oppositional defiant disorder, conduct disorder, and the high symptoms depression profile suggests that disruptive behaviour may sometimes coexist with depressive symptoms.
Fourth, irritability and sleep problems should be taken seriously, especially when autistic traits are present. These symptoms may not always indicate depression, but they may identify a subgroup requiring closer monitoring and more nuanced formulation.
Finally, parent report may be especially valuable. The study used parent-reported depressive symptoms because earlier work in the same sample found that young people with ADHD may under-report depression symptoms compared with parent reports (Fraser et al., 2018). This does not mean that young people’s self-reports are unimportant, but it reinforces the value of gathering information from multiple sources.
Conclusion
Depression symptoms in young people with ADHD are heterogeneous. Around half of the clinical ADHD sample showed relatively low depressive symptoms, while two further groups showed clinically important patterns: a high symptoms group marked by suicidal cognitions and low self-esteem, and an irritable/poor sleep group associated with higher autistic traits. These findings may help explain why depression can be missed or misunderstood in ADHD. Some symptoms overlap with ADHD, some are embedded within behavioural or neurodevelopmental presentations, and some may be under-reported by young people themselves. For clinicians, the key message is to assess depression in ADHD with nuance. Suicidal cognitions, low self-esteem, irritability, poor sleep, behavioural problems, autistic traits, and ADHD-related impairment all deserve careful attention. Understanding why young people with ADHD are at increased risk of depression requires more than recognising comorbidity. It requires asking how depressive symptoms present, which symptoms cluster together, and which young people may be at greatest risk of more severe outcomes.
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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