Seeing the Whole Child: Why Co-Occurring Conditions Matter More Than We Often Realise

Before schools broke up for the summer holidays, I was having a conversation with a teacher who asked me whether a child's emotional regulation difficulties could be explained by anxiety alone. A few days later, another professional wondered whether a learning disability might be masking underlying autistic traits, while a parent described feeling increasingly confused because every professional seemed to have a different explanation for their child's presentation. Although each conversation started in a different place, they all led to the same point. We have a tendency to search for one explanation when the reality is often far more complex.

Those conversations stayed with me because they reflected something I have been noticing more and more in my own work. Whether I am supporting families, working alongside schools or speaking with other professionals, I rarely meet children whose experiences fit neatly within a single diagnostic category. More often than not, the picture is considerably more nuanced. A child may be autistic and have ADHD. They may also experience significant anxiety, sensory processing differences, executive functioning difficulties, developmental language disorder, a learning disability or specific learning difficulties such as dyslexia or dyspraxia. None of these experiences exist in isolation, and yet we often find ourselves trying to understand them one diagnosis at a time.

I think this is partly because our systems are built around diagnostic pathways. Assessments quite understandably ask whether a child meets the criteria for autism, ADHD or another condition, and those diagnoses are incredibly important. They provide understanding, validation and access to support that many families have often waited years to receive. However, children do not experience themselves as a collection of separate diagnoses. They experience life as a whole person. Their attention, communication, sensory processing, emotional regulation, learning and relationships all interact with one another every single day, and it is often those interactions that shape how they experience the world.

Perhaps that is why I wanted to write this blog. Increasingly, I find myself wondering whether one of the biggest challenges facing families is not simply obtaining the right diagnosis, but ensuring that the whole child is seen rather than the first label that appears in their notes. Autism rarely exists in isolation, and neither does ADHD. Research consistently demonstrates high rates of co-occurrence between the two, while many children also experience anxiety, developmental language disorder, learning disabilities, specific learning difficulties, sleep difficulties or other neurodevelopmental differences alongside them. The reality is that these conditions do not simply sit alongside one another; they interact continuously, influencing how children think, learn, communicate and respond to the world around them.

Looking Beyond a Single Diagnosis

One of the reasons I think this matters so much is that it changes the questions we ask. If we approach a child believing there must be one explanation for what we are seeing, there is a risk that we begin filtering every observation through that single lens. Once a diagnosis has been identified, it can become tempting to attribute every difficulty to that diagnosis because it provides a coherent explanation. While that is entirely understandable, it can sometimes prevent us from recognising other equally important aspects of a child's profile.

Take learning disabilities as one example. They are often confused with specific learning difficulties, yet they describe very different experiences. A learning disability affects intellectual functioning and adaptive skills, influencing how an individual learns and manages everyday life. By contrast, specific learning difficulties such as dyslexia, dyscalculia and dyspraxia affect particular areas of learning while overall intellectual ability remains within the expected range. Distinguishing between these profiles is essential because they influence the kind of support children require. Assuming that every learning challenge stems from autism or ADHD risks overlooking important needs that deserve equal attention.

What makes co-occurring conditions particularly important is that they rarely operate independently. Instead, they influence one another in ways that can make a child's presentation far more complex than any single diagnosis might suggest. A child who experiences anxiety may become increasingly reliant on predictable routines. A child who masks throughout the school day may return home emotionally exhausted, making sensory sensitivities or emotional regulation much more difficult by the evening. Sleep difficulties can reduce attention and increase impulsivity. Executive functioning challenges can heighten anxiety because everyday tasks feel less predictable or manageable. Communication differences can make emotional regulation harder simply because expressing needs becomes more difficult. Each experience shapes the next, creating patterns that are often far more interconnected than we first realise.

The more I reflect on these conversations with families and professionals, the more I believe that understanding co-occurring conditions is not really about identifying as many diagnoses as possible. Rather, it is about recognising that children's experiences are rarely explained by a single label. They are shaped by the interaction of multiple strengths, challenges and environmental influences, all of which deserve to be understood if we are to provide support that genuinely reflects the child sitting in front of us.

The Heterogeneity of Neurodevelopment

One concept that I think is particularly helpful when thinking about co-occurring conditions is heterogeneity. Although it sounds like a technical term, it simply refers to the enormous variation that exists both within and between neurodevelopmental conditions. No two autistic children are exactly alike. No two children with ADHD present in precisely the same way. Even children who share the same diagnosis, are of a similar age and have comparable support needs can experience the world very differently. Their communication, sensory profiles, emotional regulation, executive functioning, learning, relationships and interests may all vary considerably. Once we begin considering co-occurring conditions such as anxiety, developmental language disorder, learning disabilities or specific learning difficulties, that diversity becomes even greater.

I sometimes wonder whether this is one of the reasons families can feel so uncertain in the early stages of seeking support. Parents often begin reading about autism or ADHD and recognise many aspects of their child, only to find that other characteristics seem completely different. It is then easy to question whether they are looking in the right place, when in reality they are encountering the natural heterogeneity that exists within neurodevelopment. Diagnoses describe patterns rather than people. They provide frameworks that help us understand common characteristics, but they can never fully capture the complexity of an individual child's experiences.

Perhaps this is also why I have become increasingly cautious about broad statements such as, "Autistic children do this," or, "Children with ADHD are like that." While there are certainly characteristics that many children share, those similarities should never overshadow the remarkable diversity that exists within these populations. Every child brings their own strengths, challenges, experiences and ways of engaging with the world, and it is that individual profile that ultimately needs to guide our understanding and support.

When One Diagnosis Overshadows Another

One of the challenges that naturally follows from this complexity is the risk of diagnostic overshadowing. Once a diagnosis has been identified, it can become tempting to view every difficulty through that single lens because it provides a coherent explanation for what we are observing. While this is entirely understandable, it can sometimes narrow our thinking in ways that unintentionally overlook other important aspects of a child's profile.

A child who is autistic may also have ADHD, yet difficulties with attention or impulsivity are assumed to be part of autism alone. A child with ADHD may experience significant sensory sensitivities that receive little attention because their presentation is viewed primarily through an ADHD lens. Equally, communication differences may be attributed solely to a learning disability when a co-occurring developmental language disorder or autism has not yet been recognised. The opposite can happen too. Difficulties associated with a learning disability may be overlooked because professionals understandably focus on the child's autism or ADHD. None of these situations arise because people lack knowledge or compassion. More often, they reflect the understandable human tendency to stop searching once we feel we have found an explanation.

This is one of the reasons I think it is so important to distinguish between learning disabilities and specific learning difficulties. These terms are often used interchangeably, but they describe very different experiences. A learning disability affects intellectual functioning and adaptive skills, influencing how someone learns and manages everyday life. By contrast, specific learning difficulties, such as dyslexia, dyscalculia and dyspraxia, affect particular areas of learning while overall intellectual ability remains within the expected range. Understanding those differences matters because they influence not only how children learn, but also the type of support they require. Assuming that every learning difficulty stems from autism or ADHD risks overlooking equally important needs that deserve careful assessment and thoughtful intervention.

Looking Beyond Behaviour

Perhaps this is where my own background in behaviour analysis has most influenced the way I think about co-occurring conditions. One of the principles that has stayed with me throughout my career is that behaviour can only really be understood when we consider the context in which it occurs. Looking only at what a child does, without considering the factors influencing that behaviour, rarely provides the full picture.

When we begin looking through that wider lens, behaviour often starts to make much more sense. A child refusing a task may not simply be avoiding work. They may be overwhelmed by sensory input, struggling to process the language within the instruction, finding the task cognitively inaccessible because of a co-occurring learning disability or experiencing anxiety after repeated experiences of feeling unsuccessful. Another child may appear impulsive because of ADHD while simultaneously finding emotional regulation more difficult due to poor sleep or heightened anxiety. The behaviour itself may look straightforward, but the experiences shaping it are rarely so simple.

This is why I have become increasingly cautious about searching for a single explanation. Behaviour is rarely the product of one isolated factor, just as neurodevelopment is rarely defined by one diagnosis. More often, what we see reflects the interaction of several different influences, each contributing something important to the child's overall experience. When we allow ourselves to hold that complexity in mind, we move away from asking, "Which diagnosis explains this behaviour?" and begin asking a far more useful question: "What combination of experiences might this child be navigating right now?"

Seeing the Whole Picture

Ultimately, I think this is what understanding co-occurring conditions really means. It is not about collecting diagnostic labels or making children's profiles appear more complex than they need to be. Rather, it is about recognising that no single diagnosis can fully explain a child's strengths, challenges or experiences. Children are always more than the criteria they meet, and supporting them well depends upon seeing how different aspects of their development interact rather than considering each one in isolation.

The more I work alongside families and professionals, the more convinced I become that our role is not simply to identify what diagnosis a child has, but to remain curious about the child sitting in front of us. Diagnoses provide invaluable frameworks for understanding, but curiosity is what allows us to see the individual beyond the label. In many ways, that is where truly person-centred support begins.

When Systems Separate What Children Experience Together

One of the things I continue to reflect on is that children experience every aspect of their development simultaneously, yet the systems around them are often organised into separate pathways. One professional may focus on communication, another on attention, another on behaviour, another on learning and another on emotional wellbeing. Each perspective is valuable, and each professional brings important expertise. The difficulty is that children do not experience themselves in separate domains. They experience all of these aspects of their development at the same time.

This is often where families find themselves in the difficult position of joining the dots between different professionals. One report may describe anxiety, another highlights autism, another identifies ADHD, while educational assessments explore learning or language. Individually, each assessment provides valuable information. Together, they begin to tell a much richer story about the child. Perhaps this is why so many parents describe feeling relieved when somebody finally steps back and looks at the whole picture rather than one part of it. Often, it is not another diagnosis they are searching for. It is an explanation that acknowledges how all of those different experiences interact.

Supporting the Child, Not the Diagnosis

The more I work alongside neurodivergent children and their families, the more convinced I become that effective support is rarely about responding to a diagnosis alone. It is about understanding how that diagnosis interacts with every other aspect of the child's development and recognising that two children with exactly the same diagnosis may require completely different approaches.

An autistic child who also has ADHD may benefit from predictable routines while simultaneously needing movement, flexibility and opportunities to regulate attention. Another autistic child with a learning disability may require adapted communication, greater repetition and significantly more support to develop everyday independence. A child with ADHD and anxiety may need strategies that reduce uncertainty before they are able to engage successfully with learning, while another with developmental language disorder may appear to understand far more than they are actually able to process. Although these children may share diagnostic labels, their support should always reflect their individual profile rather than assumptions associated with a particular condition.

Perhaps this is why I have become increasingly cautious about recommendations that begin with phrases such as, "Autistic children need..." or, "Children with ADHD respond best to..." Those statements can be helpful starting points, but they should never replace careful observation, collaboration with families and an ongoing curiosity about the child in front of us. Good practice is rarely built upon assumptions. It is built upon relationships, thoughtful assessment and a willingness to adapt as our understanding develops.

A Final Reflection

When I think back to the conversations that prompted me to write this blog, I realise they all had something in common. None of them were really about autism, ADHD, anxiety or learning disabilities in isolation. They were about adults trying to understand children whose experiences refused to fit neatly into a single explanation. In many ways, that is exactly what we should expect. Human development is inherently complex, and neurodevelopment is no exception.

Perhaps that is the most important message I hope readers take away from this discussion. Diagnoses are incredibly valuable because they provide understanding, validation and access to support, but they should never become the point at which our curiosity ends. They are frameworks that help us understand patterns, not definitions of the children themselves. Every child brings a unique combination of strengths, challenges, relationships, experiences and environments that no diagnostic label can ever fully capture.

If we can begin to move away from asking, "What diagnosis does this child have?" and instead ask, "What is this child experiencing?" we are far more likely to understand not only their behaviour, but the person behind it. Ultimately, I think that is what seeing the whole child really means, and perhaps that is the shift in thinking our children need from us most.