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How Common Is ADHD Combined Type Compared to Other Types? 

PostedJuly 24, 2025
UpdatedSeptember 17, 2025
ByMy Patient Advice

ADHD combined type refers to individuals who show both inattentive and hyperactive-impulsive traits. It is the most diagnosed form of ADHD in both adults and children. When you hear the term “combined ADHD,” this is likely the subtype most people, including professionals, are referring to. 

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ADHD Type Comparison 

  • ADHD Combined Type: The most common, making up around 50–70% of diagnoses 
  • Inattentive Type: Represents roughly 20–30%; previously known as ADD 
  • Hyperactive-Impulsive Type: Less common on its own, around 10% 

These figures are general estimates and may change based on factors such as gender and age. For instance, hyperactivity is often more noticeable in younger boys, while inattentive traits are more commonly observed in girls. 

Want to Learn More? 

Read our guide to better understand how each type of ADHD presents

Not Diagnosed Yet? 

If this sounds familiar, a clinical ADHD assessment can help identify which type most closely matches your experience. A qualified healthcare professional, such as a psychiatrist or clinical psychologist, is required to diagnose ADHD. ADHD diagnoses typically follow standards set by private practices or NHS clinical guidelines. Take our free self-assessment for ADHD.

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Victoria Rowe, MSc, author for my patient advice - mypatientadvice.co.uk

Victoria Rowe, MSc

Author

Victoria Rowe is a health psychologist with a Master’s in Health Psychology and a BS in Applied Psychology. She has experience as a school psychologist, conducting behavioural assessments, developing individualized education plans (IEPs), and supporting children’s mental health. Dr. Rowe has contributed to peer-reviewed research on mental health, including studies on anxiety disorders and the impact of COVID-19 on healthcare systems. Skilled in SPSS, Minitab, and academic writing, she is committed to advancing psychological knowledge and promoting well-being through evidence-based practice.

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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