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What Do I Do if I Suspect Adult ADHD Was Underdiagnosed? 

PostedOctober 9, 2025
UpdatedOctober 9, 2025
ByMy Patient Advice

If you suspect adult ADHD underdiagnosis, it’s important to take steps towards understanding and addressing your symptoms. Adult ADHD underdiagnosis is a common issue, especially because ADHD symptoms often present differently in adults compared to children. Many adults with ADHD go undiagnosed for years, with their symptoms often mistaken for anxiety, depression, or just being “disorganised.” 

If you’ve struggled with issues like persistent inattention, disorganisation, or impulsivity, you may be dealing with ADHD that was never properly recognised. Missed diagnosis can lead to years of untreated symptoms, which can affect work, relationships, and self-esteem. 

Take the online ADHD test

Steps to Take if You Suspect Adult ADHD Was Underdiagnosed 

Here are some practical steps if you think your ADHD may have been underdiagnosed: 

Track your symptoms  

Keep a detailed record of the challenges you face, such as forgetfulness, distractibility, or trouble managing tasks.  

Seek a comprehensive assessment  

If you haven’t had a formal ADHD evaluation or if your previous diagnosis was based on limited information, consider seeking a thorough assessment from a professional trained in adult ADHD. 

Consider your history  

Reflect on whether ADHD symptoms were present earlier in your life, even if you weren’t formally diagnosed as a child. Late recognition of ADHD in adulthood is common, especially when symptoms are overlooked or misattributed. 

Understand symptom persistence  

If you’ve noticed these symptoms consistently impacting your life, they may not just be quirks or temporary issues ADHD can persist into adulthood. 

In conclusion, by seeking a second opinion or comprehensive evaluation, you can better understand whether ADHD is at the root of your struggles.Proper diagnosis can lead to the right treatment and improved quality of life. 

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 for my patient advice - mypatientadvice.co.uk

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, author and a reviewer for my patient advice - mypatientadvice.co.uk

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. 

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