ADHD, depression and the space between neurodivergence and mental health.

ADHD is a neurodevelopmental condition. Depression is a mental health condition. On paper, the distinction seems straightforward. In real life, it is often much more complicated.

A growing body of research is beginning to look beyond simple comorbidity rates and ask a more useful question: how does one experience develop into another?

Recent longitudinal work examining pathways from ADHD to later depression suggests that the answer may change across development.

Using data from large population-based cohorts, researchers found that irritability and anxiety may play an important role in linking ADHD traits with later depressive symptoms, particularly during childhood and young adulthood. During adolescence, different mechanisms appeared to become more relevant, including negative cognitive style and a stronger sense that life outcomes are determined by outside forces rather than personal control.

The association between ADHD and later depression also appeared to be stronger in girls.

These findings matter because they challenge the idea that ADHD and depression should always be treated as completely separate clinical problems.

ADHD itself is not depression. Nor should neurodivergence automatically be framed as psychopathology. The shift towards recognising ADHD as a form of neurodevelopmental difference has been important, particularly in reducing shame and moving away from narratives that equate difference with defect.

But there is a potential problem at the other end of that conversation.

If we become so focused on protecting ADHD from being described as a mental illness that we stop looking closely at mental health, we risk overlooking the distress that can develop around it.

An individual can be neurodivergent and psychologically well. They can also be neurodivergent and anxious, depressed, chronically stressed or emotionally exhausted. Those experiences may not be part of ADHD itself, but they can become tightly intertwined with it.

This is particularly important when we consider the environments in which ADHD develops.

A child who repeatedly struggles to meet expectations around organisation, attention, emotional control or school performance may accumulate experiences of criticism and failure. An adolescent who constantly feels behind peers may begin to form negative beliefs about themselves. An adult who has spent years compensating for executive difficulties may function successfully on the outside while carrying significant internal strain.

None of those experiences mean ADHD has “turned into” depression.

But they may help explain why depression becomes more likely for some people over time.

The developmental aspect of the recent findings is especially interesting. If different pathways are more important at different ages, then prevention may also need to be developmentally sensitive.

In childhood, paying attention to anxiety and irritability may be particularly important. In adolescence, negative thinking patterns and perceived lack of control may become more relevant. In young adulthood, the picture may change again as academic, occupational and relational demands increase.

This has implications not only for clinicians, but also for parents, teachers, coaches and anyone working with people with ADHD.

Neurodivergence does not necessarily need to be treated as pathology. But distress still deserves attention.

And if research can identify the pathways through which distress develops, we may become better at intervening before it becomes something more serious.

Research reference

Padaigaitė-Gulbinienė, E., Hammerton, G., Heron, J., Eyre, O., Michelini, G., Wilson-Newman, A., Garavini, C., Eley, T. C., Thapar, A., & Riglin, L. (2026). Clinical and Cognitive Mediators Underlying Subsequent Depression in Individuals With Attention-Deficit/Hyperactivity Disorder: A Developmental Approach. Journal of the American Academy of Child & Adolescent Psychiatry.

https://doi.org/10.1016/j.jaac.2026.06.001