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Why Does ADHD Look Different in Different People? 

PostedOctober 15, 2025
UpdatedOctober 15, 2025
ByMy Patient Advice
Author: Phoebe Carter, MSc | Reviewed by: Dr. Rebecca Fernandez, MBBS

ADHD variability is one of the reasons why the condition can look so different from person to person. ADHD is a neurodevelopmental disorder that affects attention, focus, and impulse control, but the way it manifests can vary significantly across individuals. This individual presentation is influenced by factors like age, gender, environment, and even co-occurring conditions, which is why two people with ADHD may experience it in unique ways. 

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Symptom Differences in ADHD 

ADHD is often characterised by symptom differences, particularly between the more commonly recognised hyperactive type and the inattentive type. Some individuals with ADHD may be highly energetic, impulsive, and struggle with sitting still or controlling their impulses, while others may be quietly distracted, forgetful, and struggle with organisation but not display outward hyperactivity. These differences mean that one person might be labelled as disruptive in school or work, while another may be seen as unmotivated or lazy, despite both having ADHD. 

Factors Influencing ADHD Presentation 

Several factors contribute to ADHD variability: 

Age:  

ADHD symptoms may change over time. Hyperactivity often decreases with age, while inattention or impulsivity may persist into adulthood. 

Gender:  

ADHD is often underdiagnosed in females, who may show more subtle symptoms like daydreaming and disorganisation, rather than hyperactivity. 

Co-occurring Conditions:  

Many people with ADHD also have anxiety, depression, or learning disabilities, which can alter the way ADHD symptoms present and impact treatment. 

Understanding the individual presentation of ADHD is essential for accurate diagnosis and tailored treatment plans that address specific needs. 

Visit providers like ADHD Certify for personal consultations to better understand how brain imaging can inform ADHD treatment.  

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

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Phoebe Carter, MSc
Author

Phoebe Carter is a clinical psychologist with a Master’s in Clinical Psychology and a Bachelor’s in Applied Psychology. She has experience working with both children and adults, conducting psychological assessments, developing individualized treatment plans, and delivering evidence-based therapies. Phoebe specialises in neurodevelopmental conditions such as autism spectrum disorder (ASD), ADHD, and learning disabilities, as well as mood, anxiety, psychotic, and personality disorders. She is skilled in CBT, behaviour modification, ABA, and motivational interviewing, and is dedicated to providing compassionate, evidence-based mental health care to individuals of 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, 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.