Why is Autism Often Misdiagnosed as ADHD?

PostedNovember 12, 2025

UpdatedNovember 12, 2025

ByMy Patient Advice

Author: Beatrice Holloway, MSc | Reviewed by: Dr. Rebecca Fernandez, MBBS

It’s surprisingly common for autism to be misdiagnosed as ADHD, especially in children. Both conditions affect attention, behaviour, and social interaction, making it difficult for professionals to distinguish between the two without a comprehensive evaluation. Diagnostic challenges often arise when traits such as impulsivity, restlessness, or poor focus are automatically attributed to ADHD without considering the possibility of autism.

One major issue is symptom overlap. While ADHD is known for inattention and hyperactivity, autism can also involve attention issues, though they usually come from a different source such as difficulty switching focus or coping with sensory overload. If clinicians focus only on surface behaviours rather than the root causes, they may miss critical signs of autism, especially in children who are verbal or perform well academically.

Behaviours That Can Be Misread

Here are some behaviours that commonly lead to a misdiagnosis of ADHD instead of autism:

Difficulty Staying Focused

This might be due to sensory distractions in autism, not necessarily impulsivity or lack of interest as seen in ADHD.

Interrupting or Talking Over Others

In autism, this can come from challenges with reading social cues, while in ADHD it’s more about impulsivity.

Seeming Disorganised or Forgetful

This may stem from executive functioning difficulties in both conditions, but the reasons and interventions can differ.

Understanding the nuanced differences helps avoid mislabelled diagnoses and ensures individuals get the support that truly fits.

Visit providers like Autism Detect for personal consultations.

For a deeper dive into the science, diagnosis, and full treatment landscape,read our complete guide to misdiagnosis and differential diagnosis.

Beatrice Holloway, MSc

Author

Beatrice Holloway is a clinical psychologist with a Master’s in Clinical Psychology and a BS in Applied Psychology. She specialises in CBT, psychological testing, and applied behaviour therapy, working with children with autism spectrum disorder (ASD), developmental delays, and learning disabilities, as well as adults with bipolar disorder, schizophrenia, anxiety, OCD, and substance use disorders. Holloway creates personalised treatment plans to support emotional regulation, social skills, and academic progress in children, and delivers evidence-based therapy to improve mental health and well-being across all ages.

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.