How Common is ADHD with Adult Autism?

PostedNovember 7, 2025

UpdatedNovember 7, 2025

ByMy Patient Advice

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

ADHD and adult autism often co-occur, with many adults diagnosed with autism also showing symptoms of ADHD. Studies indicate that dual diagnosis of ADHD and adult autism can be quite prevalent, with estimates suggesting up to 30-50% of autistic adults also have ADHD. The overlap between these two conditions can sometimes complicate diagnosis, as they share similar traits like difficulty with attention, impulsivity, and challenges in social settings.

Neurodevelopmental Overlap

The reasons for the overlap are as follows:

Co-occurrence:

Both ADHD and adult autism are neurodevelopmental disorders that impact cognitive and emotional functioning. This overlap often results in similar challenges, such as difficulties with social interaction, time management, and emotional regulation. Recognising these shared traits can help guide diagnosis and treatment.

Symptoms:

Individuals with both ADHD and autism may struggle to focus, manage emotions, and engage in social situations. These difficulties often affect their work, personal relationships, and overall well-being. The combination of these symptoms can feel overwhelming, especially if the conditions are undiagnosed or misdiagnosed.

Medication:

Stimulant medications, commonly used to treat ADHD, can improve focus and impulse control. However, individuals with autism may respond differently to these medications, requiring personalised adjustments.

Cognitive Behavioural Therapy (CBT):

CBT can help manage emotional regulation, teach coping strategies for social interactions, and improve organisational skills, addressing both ADHD and autism symptoms.

For personalised support, visit providers like Autism Detect for personal consultations tailored to your needs.

For a deeper dive into the science, diagnosis, and full treatment landscape, read our complete guide to late diagnosis in adults.

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.