You’ve probably heard it before—“ADHD is overdiagnosed in adults”. Maybe you’ve even had colleagues or friends voice concerns that stimulants are being prescribed too freely, especially in light of the national shortage. And with TikTok influencers offering ADHD “self-diagnosis checklists,” it’s easy to see why some might feel skeptical.
But when it comes to the research, the picture is different.
In reality, ADHD is underdiagnosed—particularly in adults. And that’s a problem, because ADHD is also one of the most treatable conditions in all of psychiatry.
The Real Story Behind ADHD Diagnosis
ADHD has never been more visible in public conversation. Between social media, press coverage, and growing awareness of neurodiversity, the topic is everywhere. But for clinicians, there’s often confusion about how to confidently diagnose adult ADHD—especially without formal guidelines for adult treatment in place (yet).
As PMHNPs, this creates a critical challenge: How do we separate signal from noise and ensure we’re diagnosing ADHD accurately?
Adult ADHD is actually significantly underdiagnosed, with research pointing to factors like cultural norms, stigma, and systemic gaps in adult mental health care. One review, Under Diagnosis of Adult ADHD: Cultural Influences and Societal Burden, highlights how societal perceptions and structural barriers often prevent accurate recognition and treatment of this highly treatable condition.
Key Clinical Insights for Diagnosing Adult ADHD
Here are two patterns every psych NP should understand to improve ADHD evaluation in adults.
Look Beyond the “Obvious” Symptoms
Hyperactivity and impulsivity often get the spotlight, but they’re not the most reliable indicators in adults. Instead, look for deficits in executive function—particularly in working memory and time perception.
Common clinical patterns include:
- Chronic lateness
- Difficulty estimating how long tasks will take
- Struggling to complete sequential, multi-step activities
These cognitive difficulties are subtle but telling signs of ADHD that often go unnoticed in traditional evaluations.
Understand the “Interest-Based Nervous System”
Adults with ADHD often don’t have a deficit of attention—they have a challenge regulating it. This shows up as:
- The ability to hyperfocus on high-interest activities
- Inability to engage with “boring” but essential tasks
- Patterns that get mislabeled as procrastination or low motivation
Recognizing this paradox helps you better differentiate ADHD from mood disorders or personality-based issues like poor discipline or laziness.
Learning From ADHD Experts in the Field
I’ve had the pleasure of learning from Jean Tidd, MSW, LISW-S, ADHD-CCSP, SAP, who’s a CHADD advisory board member (CHADD is the leading nonprofit for people affected by ADHD). Jean has over 30 years of experience supporting ADHD diagnosis and care, and she emphasizes the importance of noticing non-obvious signs during evaluation.
Currently, there are no formal clinical guidelines for adult ADHD treatment—leaving many of us to rely on experience, continuing education, and expert insight. Fortunately, national guidelines are in development and are expected to be released later in 2025.
In the meantime, clinicians like Jean are sharing insights that help fill in the gaps. ADHD
Get Better at Diagnosing Adult ADHD
If ADHD evaluations feel confusing or overwhelming, you’re not alone. Whether you’re hoping to hone your skills or feel more confident recognizing atypical presentations, it’s worth learning from experts who’ve been in the field for decades.
Want more actionable tips like these? Join my free Master Mental Health training or follow along on Instagram @StressFreePsychNP for more real-world, practice-ready strategies for diagnosing and treating mental disorders.