By The Misfit Collaborative
Here is something that surprises a lot of parents when they start learning about their child’s profile: the learning difference their child was diagnosed with is often not the only one.
ADHD and dyslexia frequently co-occur. Dyslexia and dyspraxia travel together. Autism and ADHD — once thought to be mutually exclusive in the diagnostic framework — are now known to co-occur in a significant portion of people. Sensory processing difficulties show up alongside almost everything.
This is not a coincidence. It reflects something real about how neurodevelopmental differences are distributed in the brain — and understanding it changes how you think about assessment, support, and the child in front of you.
Why do learning differences co-occur so often?
The short answer is that neurodevelopmental conditions share genetic and neurological roots. They are not separate categories that happen to bump into each other occasionally. They are overlapping expressions of the same underlying differences in brain development.
Research on what’s sometimes called the “p factor” in psychiatry — a general factor underlying many neurodevelopmental and mental health conditions — suggests that a significant amount of what we label as separate diagnoses reflects different presentations of the same underlying neurodivergence, filtered through different cognitive profiles, different environments, and different life experiences.
This doesn’t mean the distinctions are meaningless. ADHD and autism are meaningfully different profiles in many ways. But it does explain why they co-occur so frequently — and why finding one should prompt looking for others.
Common co-occurring pairs (and clusters)
ADHD and dyslexia. Co-occur in approximately 30–40% of people with either diagnosis. Both affect reading fluency and sustained attention, and they can be difficult to disentangle without careful assessment. The working memory and processing speed difficulties in ADHD contribute to reading difficulty in ways that can look like dyslexia — and vice versa.
ADHD and dyspraxia (DCD). Co-occur in around 50% of DCD cases. Both affect executive function and motor planning, and the combined profile creates significant challenges with handwriting, organisation, and self-management.
ADHD and autism. Until 2013, the DSM explicitly excluded co-diagnosis of ADHD and autism. The DSM-5 removed that exclusion, reflecting overwhelming clinical and research evidence that the two co-occur in a substantial proportion of autistic people — estimates vary from 30–80% depending on how autism is defined. The combined profile looks different from either alone and requires a more nuanced approach to support.
Autism and anxiety. Co-occur in up to 50% of autistic people. Anxiety is sometimes a feature of autism (the sensory demands of navigating a world not designed for you are inherently stressful) and sometimes a co-occurring condition. The distinction matters for treatment.
Dyslexia and dyspraxia. Share a significant genetic overlap and frequently co-occur, particularly in children who have phonological processing difficulties alongside motor coordination difficulties.
Sensory processing difficulties and autism/ADHD. Sensory differences are now included in the DSM-5 autism criteria and are extremely common in ADHD as well. For many neurodivergent children, sensory processing difficulties are as significant as any labelled condition — and often go unaddressed because they’re not the diagnosis.
The assessment problem
Most psychological assessments are designed to identify one or two specific conditions. A referral for “dyslexia assessment” typically produces information about dyslexia — not necessarily about the ADHD that’s also there, or the DCD that’s also there, or the anxiety that’s driving half the school refusal.
This creates a partial picture. Parents leave with one piece of the puzzle and wonder why the support for that piece isn’t working as well as they hoped.
Comprehensive psychoeducational assessment — looking across the full range of possible learning and developmental differences — is more expensive and more time-consuming than targeted assessment. In India, where specialist assessment is already limited and expensive, comprehensive evaluation is often not accessible. Many children are assessed for the most visible or most academically impairing difficulty and the rest goes unidentified.
This matters because the co-occurring profile changes the intervention. A child with dyslexia alone responds differently to reading intervention than a child with dyslexia and ADHD. A child with autism alone needs different support than a child with autism and anxiety and sensory processing difficulties. Getting the full picture is not bureaucratic over-identification — it’s necessary for understanding what will actually help.
The presentation problem
Co-occurring profiles can mask each other in ways that complicate identification.
A highly anxious autistic child may appear to have ADHD because the anxiety is driving distractibility and avoidance that looks like inattention. A child with dyspraxia may appear to have ADHD because the executive function difficulties in DCD overlap so significantly with ADHD. A 2e child (gifted and neurodivergent) may appear to have none of these things because their intelligence is compensating for all of them.
Getting this wrong isn’t a failure of effort — it’s a consequence of diagnostic systems that were designed to identify conditions in isolation and are now being applied to people whose profiles are rarely that clean.
What this means in practice
For parents: if your child has been diagnosed with one learning difference and is still significantly struggling despite appropriate support, it’s worth asking whether there’s more to the picture. A co-occurring profile that hasn’t been identified is often what’s in the gap.
For schools: support plans built around a single diagnosis often fail children with co-occurring profiles. A child who has dyslexia accommodations but no support for the ADHD that’s also present is not fully supported.
For clinicians and assessors: a comprehensive developmental history, broad assessment across domains, and willingness to consider multiple simultaneous profiles produces better outcomes than diagnostic parsimony applied to conditions that are neurologically linked.
For neurodivergent adults making sense of their own history: the multiple things you’ve always known about yourself — the reading difficulty, the coordination challenges, the sensory sensitivities, the social differences — may all be parts of the same picture. Finding language for each of them separately is useful. Understanding that they’re related is often a deeper relief.
A diagnosis is not a ceiling — it’s a doorway. Getting the right diagnosis, or the right combination of them, opens access to understanding and support that changes what the rest of school (and life) looks like.
If you’re trying to build assessment and support processes that account for co-occurring profiles, we’d love to work with you.
The Misfit Collaborative works with Indian schools and families on building nuanced, whole-child understanding of neurodivergent profiles — including the complex ones.
