TL;DR
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A study published in JAMA Psychiatry found that adults with ADHD had higher rates of dementia or cognitive impairment than those without ADHD in a cohort of more than 187,000 people aged 50 and older. The findings show an association, not proof that ADHD causes dementia; researchers also reported a link with genetic risk for ADHD.
A study led by researchers at the University of Pittsburgh School of Medicine found that adults with attention-deficit/hyperactivity disorder (ADHD) were more likely to develop dementia or other cognitive impairment later in life than adults without ADHD. Published in JAMA Psychiatry on October 7, 2026, the analysis of more than 187,000 U.S. adults also linked higher genetic risk for ADHD with greater dementia risk, but it does not establish that ADHD causes dementia.
The researchers analyzed health records and genetic data from adults aged 50 and older enrolled in the National Institutes of Health’s All of Us Research Program. During the study, 6.7% of participants with ADHD developed dementia or cognitive impairment, compared with 3.4% of those without ADHD. After accounting for age, sex and other health conditions, the team reported that participants with ADHD had more than four times the risk of developing cognitive impairment over time.
The researchers also calculated genetic risk scores based on common genetic variants associated with ADHD. Participants in the group with the highest genetic risk had a 35% greater chance of developing dementia than those in the group with the lowest risk. A genetic risk score is not a diagnosis of ADHD; it estimates genetic association, including for people who may never have received a formal diagnosis.
Among participants who developed cognitive impairment, those with a co-occurring ADHD diagnosis reported worse mental health, lower quality of life and less social satisfaction than those with dementia alone. They also used about 20% more health care in the year after diagnosis. The study reports these differences within its sample; it does not show that ADHD itself caused poorer outcomes or higher health care use.
ADHD and the Burden of Cognitive Decline
The findings add evidence that ADHD may be relevant to cognitive aging, not only to attention and functioning earlier in life. The study brings together two kinds of evidence—clinical diagnoses in health records and genetic associations—in a large U.S. sample. That may help researchers investigate whether the observed relationship reflects shared biology, health factors, or other processes.
The reported differences among people who developed cognitive impairment also point to a practical concern: patients with both conditions may face greater mental-health and social challenges and use more health care after diagnosis. The study does not establish what support would improve those outcomes, but it identifies a group whose needs merit further investigation.
For readers, the results are not evidence that an individual with ADHD will develop dementia, nor do they establish that treatment prevents it. The study describes differences in risk across groups. Individual outcomes and the causes of cognitive decline cannot be determined from these findings alone.
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How the Study Tested the Link
Earlier research had reported links between ADHD and dementia in populations outside the United States. The new work, led by the team of senior author Tharick A. Pascoal, extends that line of research using All of Us health records and genetic data. The authors describe it as the largest and most comprehensive study to date to combine clinical ADHD diagnoses and genetic information within the same population.
The team also considered whether early dementia symptoms might sometimes be mistaken for ADHD before a cognitive diagnosis is made. The association remained statistically significant when researchers required at least eight years between an ADHD diagnosis and the onset of cognitive impairment. That timing makes misdiagnosis less likely to explain the entire association, according to the report, but it does not rule out other explanations.
The research builds on work from Pascoal’s laboratory, including a 2022 study that linked genetic risk for ADHD with Alzheimer’s-related brain changes in older adults who were cognitively unimpaired. The current study examines later diagnoses and reported health outcomes; it does not by itself identify the biological pathway behind the relationship.
“Two different kinds of evidence are pointing in the same direction.”
— Tharick A. Pascoal, senior author and associate professor of psychiatry and neurology at the University of Pittsburgh
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What the Risk Estimates Cannot Show
The study is observational, so it cannot determine whether ADHD contributes to dementia risk, whether other factors influence both conditions, or whether some diagnoses reflect overlapping symptoms. The fourfold figure is an adjusted association reported by the researchers, not a prediction that any particular person with ADHD will develop cognitive impairment. The study summary does not provide enough detail to interpret that estimate as an individual’s absolute risk.
Researchers also do not yet know whether ADHD medications, including stimulants, affect dementia risk over time. Nor did this study establish whether management of cardiovascular health—associated with both ADHD and dementia—could change cognitive outcomes. The report does not show that medication or cardiovascular interventions prevent dementia.
The analysis used health records and genetic data from participants in one U.S. research program. The supplied study summary does not detail how representative the participants were of all adults with ADHD, or provide enough information to assess how diagnoses and follow-up varied across the full cohort. Those factors, as well as the mechanisms behind the association, remain questions for further research.
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Questions for Follow-Up Research
The researchers say additional work is needed to identify what may account for the association and whether any contributing factors can be changed. Follow-up studies could examine ADHD treatment, cardiovascular health and cognitive outcomes over time, while distinguishing the effects of ADHD itself from related health and social factors.
The paper, “Attention-Deficit/Hyperactivity Disorder and Late-Life Cognitive Impairment,” was published in JAMA Psychiatry and is listed with DOI 10.1001/jamapsychiatry.2026.3165. The current report does not announce a treatment recommendation or a change to clinical guidance. For now, the central finding remains an association that warrants further study, not a proven cause or a demonstrated way to prevent dementia.
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Key Questions
Does ADHD cause dementia?
No causal link was established. The study found an association between ADHD and later cognitive impairment, but an observational analysis cannot prove that ADHD causes dementia.
How many people were included in the study?
The researchers analyzed health records and genetic data from more than 187,000 adults aged 50 and older enrolled in the NIH All of Us Research Program.
What did the study find about genetic risk?
Participants in the group with the highest genetic risk for ADHD had a 35% greater chance of developing dementia than participants with the lowest genetic risk. A genetic risk score is not the same as an ADHD diagnosis.
Can ADHD medication lower dementia risk?
The study did not answer that question. The researchers identified the long-term effects of ADHD medications as an area for future research.
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