Nikhil Prasad Fact checked by:Thailand Medical News Team Jun 19, 2026 1 hour, 29 minutes ago
Medical News: A major new review has found that people diagnosed with Attention Deficit Hyperactivity Disorder (ADHD) may face a significantly higher risk of developing dementia as they age, raising fresh concerns about the long-term effects of a condition often associated only with childhood and young adulthood.
Large international analysis finds that people with ADHD may face a significantly higher risk of developing dementia as they age
Researchers conducted a large systematic review and meta-analysis examining whether ADHD could increase the likelihood of dementia later in life. Their findings suggest that individuals with ADHD have more than twice the risk of developing dementia compared to those without the disorder.
Growing Evidence of a Hidden Long-Term Risk
ADHD is commonly characterized by symptoms such as inattention, impulsivity, disorganization, forgetfulness, and hyperactivity. While it is typically diagnosed in childhood, experts now recognize that the condition often persists into adulthood and can affect many aspects of life, including education, employment, relationships, and physical health.
The research team analyzed five eligible studies involving more than 3.7 million participants from countries including Israel, Sweden, Taiwan, Argentina, and Italy.
The researchers were affiliated with the Department of Diagnostic, Interventional and Stroke Radiology and UOC Neurology at AOUP “P. Giaccone,” the Department of Biomedicine, Neuroscience and Advanced Diagnostics, and the Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties at the University of Palermo, Italy, along with the National Center for Disease Prevention and Health Promotion at the Italian National Institute of Health in Rome.
After combining data from four large cohort studies involving 3,703,877 individuals, the researchers found that ADHD was associated with a 2.52-fold higher risk of all-cause dementia. Some individual studies reported even stronger associations, with dementia risks ranging from 1.4 times to over 4 times higher among people with ADHD.
Why Might ADHD Increase Dementia Risk?
Scientists believe several explanations may account for the connection. One possibility is that ADHD and dementia share common biological pathways. Changes in brain development that contribute to ADHD early in life may also make the brain more vulnerable to neurodegenerative diseases decades later.
Another theory is that people with ADHD are more likely to develop known dementia risk factors, including cardiovascular disease, obesity, diabetes, smoking habits, psychiatric disorders, and substance abuse. However, many of the studies adjusted for these factors and still found a significant association.
This
Medical News report highlights that the researchers also examined whether the findings could simply reflect diagnostic confusion. Since dementia can cause symptoms such as poor attention, memory problems, and executive
dysfunction, some older adults with early dementia might mistakenly be diagnosed with ADHD. However, several of the included studies specifically addressed this issue by excluding dementia cases that appeared shortly after ADHD diagnosis and still found a strong link between the two conditions.
Surprising Findings for Specific Dementia Types
Although the overall dementia risk was clearly elevated, the picture became more complicated when researchers examined individual dementia subtypes.
No significant association was found between ADHD and Alzheimer's disease, the most common form of dementia. This was unexpected because Alzheimer's accounts for the majority of dementia cases worldwide.
On the other hand, the available evidence suggested a potentially strong relationship between ADHD and Lewy body dementia, a disease associated with abnormal protein deposits in the brain. Two studies reported notably elevated risks, with one finding an increase exceeding fourteenfold.
Researchers also found mixed but intriguing evidence regarding vascular dementia. One study reported that ADHD patients were more than six times as likely to develop vascular dementia, even after accounting for cardiovascular risk factors.
Scientists believe disruptions involving dopamine and noradrenaline signaling in the brain may help explain the observed links, particularly for Lewy body dementia, although definitive biological evidence is still lacking.
Important Limitations Remain
The researchers caution that more studies are needed. Only five studies met the strict inclusion criteria, and definitions of both ADHD and dementia varied across investigations. Additionally, data on specific dementia subtypes remain limited.
Conclusion
The findings provide some of the strongest evidence to date that ADHD may not simply be a childhood disorder but a lifelong condition with important implications for brain health in old age. The analysis suggests that individuals with ADHD face a substantially increased risk of developing dementia, even after accounting for many traditional risk factors. While researchers cannot yet prove a direct cause-and-effect relationship, the results underscore the importance of early diagnosis, ongoing management, and long-term monitoring of people with ADHD. Future research may reveal whether treating ADHD more effectively throughout life could help reduce dementia risk decades later.
The study findings were published in the peer reviewed journal: Brain Sciences.
https://www.mdpi.com/2076-3425/16/6/646
For the latest on ADHD and dementia, keep on logging to Thailand
Medical News.
Read Also:
https://www.thailandmedical.news/articles/alzheimer,-dementia-
Share
Tweet
Share
