Co-occurring Conditions: Meaning and Examples — NeuroDiversion
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NeuroDiversion

Neurodivergent glossary

General Neurodivergence

Co-occurring Conditions

The reality that neurodivergent conditions rarely travel alone—ADHD, autism, dyslexia, anxiety, and others overlap so frequently that the "pure" single-diagnosis case is more the exception than the rule.

What it means

Co-occurring conditions (also called comorbidities, though many communities prefer the less pathologizing term) refers to the frequent overlap of multiple neurodivergent conditions in the same person. The numbers are striking: about 50-70% of people with ADHD also meet criteria for at least one other condition. More than 70% of autistic people have at least one co-occurring condition. Dyslexia and ADHD co-occur in 20-40% of cases.

This isn't coincidence. Many neurodivergent conditions share underlying neurological features—differences in executive function, sensory processing, dopamine regulation, and neural connectivity. The boundaries between conditions are often blurrier than diagnostic categories suggest. A person might have executive dysfunction that looks like ADHD, sensory differences that look like autism, and reading difficulties that look like dyslexia—and all three might be aspects of the same neurological variation.

Understanding co-occurrence matters because treatment and support need to address the full picture. Treating ADHD without accounting for co-occurring anxiety may not work. Supporting autism without recognizing co-occurring ADHD misses half the challenge. The most effective approaches see the whole person, not a list of separate diagnoses.

In practice

What this can look like

  • You get diagnosed with ADHD and start medication. Some symptoms improve dramatically, but others don't budge. It takes another two years to discover you're also autistic, and the unresolved symptoms make much more sense through that lens.
  • Your child's psychologist says they have "just ADHD." But the sensory sensitivities, the rigid routines, and the social exhaustion don't fit neatly into that box. You push for a broader evaluation and discover autism was there all along.

Context

Clinical context

Research consistently shows high rates of co-occurrence across neurodevelopmental conditions. The National Comorbidity Survey Replication found that 89% of adults with ADHD had at least one co-occurring psychiatric condition.

Community note

The neurodivergent community increasingly uses terms like "co-occurring" and "overlapping" instead of "comorbid" because the latter implies each condition is a separate disease rather than an interconnected aspect of the same neurological variation.

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Related terms

ADHD A neurodevelopmental condition affecting attention regulation, impulse control, and executive function—not a deficit of attention, but a difference in how attention is allocated. Anxiety A persistent state of worry, dread, or physiological tension—extremely common alongside ADHD and autism, where it often looks different from textbook descriptions. Twice-Exceptional Being both gifted and having a learning disability or neurodivergent condition—often resulting in both strengths and struggles being overlooked. Neurodivergent A person whose brain functions differently from what society considers typical—including people with ADHD, autism, dyslexia, Tourette syndrome, and other neurological variations.

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