Comorbidity
Comorbidity is the simultaneous presence of two or more health conditions in the same person. In ADHD, comorbidities are extremely common — an estimated more than 60% of people with the condition have at least one additional diagnosis.
The most common comorbidities in ADHD include: anxiety disorders (in up to 50% of cases), depression (30–40%), oppositional defiant disorder in children, dyslexia and other specific learning disorders, sensory processing differences, and autism spectrum disorder.
The presence of comorbidities complicates both diagnosis (symptoms can overlap) and treatment (what helps one condition can affect another). That's why a complete diagnostic evaluation that considers all present conditions is essential for an effective treatment plan.
💡 Practical example
Someone diagnosed with depression who doesn't respond well to antidepressants may have undiagnosed ADHD as an underlying condition — treating only the depression without addressing the ADHD often leads to a partial response.
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