Could memory loss be early dementia mistaken as ADHD?

PostedOctober 17, 2025

UpdatedOctober 18, 2025

ByMy Patient Advice

Author: Avery Lombardi, MSc | Reviewed by: Dr. Rebecca Fernandez, MBBS

If you’re noticing frequent memory lapses, it’s natural to wonder whether the cause is ADHD or something more serious like early dementia. Both conditions can share symptoms like forgetfulness, disorganisation, and distraction which makes the dementia vs ADHD distinction crucial, especially in adults.

ADHD is a neurodevelopmental condition present from childhood, while dementia is a progressive cognitive decline typically linked to ageing. However, because ADHD often goes undiagnosed until adulthood, its symptoms, especially in later life can be misinterpreted as signs of early dementia. Likewise, misdiagnosis in either direction can delay the right treatment and support.

Key differences between ADHD and dementia-related memory loss

Here’s how to spot the differences between memory lapses caused by ADHD versus early dementia:

Symptom onset

ADHD symptoms are typically lifelong, even if they worsen or change with age. Dementia symptoms usually begin later in life and progressively worsen over time.

Type of memory affected

People with ADHD often struggle with working memory forgetting tasks, misplacing items, or losing focus. Dementia is more likely to affect long-term memory, such as forgetting names of close relatives or recent life events.

Response to structure and prompts

ADHD-related forgetfulness often improves with external cues, reminders, or structured routines. Dementia symptoms are less responsive to such strategies and tend to progress regardless of interventions.

In conclusion, if you’re concerned about whether your memory lapses are due to dementia vs ADHD, a full clinical assessment is essential.

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 Zoning out & Forgetfulness in ADHD.

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

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.