Free Health Updates
Skip to main content
Table of Contents
< All Topics
Print

Is Underdiagnosis More Common in Adult ADHD? 

Posted
Updated
ByMy Patient Advice
Author: Avery Lombardi, MSc | Reviewed by: Dr. Rebecca Fernandez, MBBS

Yes, adult ADHD underdiagnosis is more common than many realise. Despite increasing awareness of adult ADHD, a significant ADHD diagnosis gap still exists. While children are frequently diagnosed, adults with ADHD often go undiagnosed for years, leaving them to struggle without the support they need. 

In adults, ADHD symptoms often present differently from childhood. Instead of the classic hyperactivity and impulsivity, many adults experience issues like chronic disorganisation, time management difficulties, and emotional dysregulation. These subtler signs can easily be overlooked or misdiagnosed as stress, anxiety, or even depression. 

Take the online ADHD test

Why Is Adult ADHD Underdiagnosis So Common? 

There are several factors contributing to the higher rates of adult ADHD underdiagnosis: 

Delayed recognition  

Many adults aren’t diagnosed until later in life, often only after seeing content or hearing stories that resonate with their own experiences. 

Cultural expectations  

Adults are expected to “outgrow” childhood behaviours like hyperactivity, which leads to the assumption that ADHD isn’t relevant in adulthood. 

Diagnostic challenges  

ADHD symptoms in adults are less overt, especially in those who have developed coping mechanisms, making it harder for doctors to recognise the condition. 

In conclusion, the ADHD recognition gap for adults means that many live with untreated symptoms, which can have a significant impact on their work, relationships, and mental health. Addressing the persistent ADHD diagnosis gap is key to improving recognition and support for adults with ADHD. 

Visit providers like ADHD Certify for personal consultations and expert guidance tailored to your unique situation. 

For a deeper dive into the science, diagnosis, and full treatment landscape, read our complete guide to Overdiagnosis vs. Underdiagnosis in ADHD.  

Take the online ADHD test
Avery Lombardi, MSc
Author

Avery Lombardi is a clinical psychologist with a Master’s in Clinical Psychology and a Bachelor’s in Psychology. She has professional experience in psychological assessment, evidence-based therapy, and research, working with both child and adult populations. Avery has provided clinical services in hospital, educational, and community settings, delivering interventions such as CBT, DBT, and tailored treatment plans for conditions including anxiety, depression, and developmental disorders. She has also contributed to research on self-stigma, self-esteem, and medication adherence in psychotic patients, and has created educational content on ADHD, treatment options, and daily coping strategies.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the author's privacy. 

Dr. Rebecca Fernandez, MBBS
Reviewer

Dr. Rebecca Fernandez is a UK-trained physician with an MBBS and experience in general surgery, cardiology, internal medicine, gynecology, intensive care, and emergency medicine. She has managed critically ill patients, stabilised acute trauma cases, and provided comprehensive inpatient and outpatient care. In psychiatry, Dr. Fernandez has worked with psychotic, mood, anxiety, and substance use disorders, applying evidence-based approaches such as CBT, ACT, and mindfulness-based therapies. Her skills span patient assessment, treatment planning, and the integration of digital health solutions to support mental well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the reviewer's privacy. 

Categories