10/7/2026
PITTSBURGH — Adults with attention-deficit/hyperactivity disorder, or ADHD, face a significantly higher risk of developing dementia or mild cognitive impairment later in life, according to a study led by University of Pittsburgh School of Medicine researchers published Oct. 7, 2026, in JAMA Psychiatry. ADHD is a neurodevelopmental condition marked by persistent inattention, hyperactivity and impulsivity.
Key Takeaways
- Pitt-led researchers analyzed health records and genetic data from more than 187,000 adults age 50 and older enrolled in the National Institutes of Health's All of Us Research Program.
- 6.7% of participants with ADHD developed dementia or cognitive impairment, compared with 3.4% of those without ADHD — more than four times the risk after adjusting for age, sex and other health conditions.
- Participants with the highest genetic risk scores for ADHD had a 35% greater chance of developing dementia than those with the lowest genetic risk scores, even without a documented ADHD diagnosis.
- Among participants who developed cognitive impairment, those with a comorbid ADHD diagnosis reported worse mental health and quality of life and used about 20% more health care in the following year than those with dementia alone.
- The association held even when researchers required at least eight years between an ADHD diagnosis and the onset of cognitive impairment, making misdiagnosis of early dementia symptoms as ADHD a less likely explanation.
ADHD diagnosis linked to more than fourfold risk of cognitive impairment
Researchers analyzed health records and genetic data from more than 187,000 adults aged 50 and older enrolled in the National Institutes of Health's All of Us Research Program. They found that 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, people with ADHD had more than four times the risk of developing cognitive impairment over time.
Genetic risk score for ADHD tied to dementia risk without a diagnosis
Researchers also calculated each participant's genetic risk score for ADHD — a measure of how much a person's common genetic variants are associated with the condition, regardless of whether they were ever formally diagnosed. People with the highest genetic risk had a 35% greater chance of developing dementia than those with the lowest risk.
"This doesn't prove that ADHD causes dementia, but seeing the same pattern show up independently in medical records and in people's genes gives us greater confidence that the association is not simply an artifact of how ADHD gets diagnosed," said senior author Tharick A. Pascoal, M.D., Ph.D., associate professor of psychiatry and neurology at Pitt. "Two different kinds of evidence are pointing in the same direction."
ADHD compounded quality of life and health care use after a dementia diagnosis
Among participants who developed cognitive impairment, those with a comorbid 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 overall in the year following diagnosis.
"We're replicating a pattern that's been observed in other countries, now in a large U.S. sample, and adding genetic evidence on top of it," said Douglas Teixiera Leffa, M.D., Ph.D., who completed his psychiatry residency at UPMC. "That combination gives us more confidence that ADHD deserves a closer look as a potential factor in cognitive aging."
Eight-year lag test addressed concerns about misdiagnosis
One possibility is that early, undetected dementia symptoms are sometimes mistaken for ADHD before a formal cognitive diagnosis is made. The association remained statistically significant even when researchers required at least eight years to pass between an ADHD diagnosis and the onset of cognitive impairment, making that explanation less likely to account for the full effect.
Several questions remain unanswered, including whether ADHD medications, such as stimulants, might lower dementia risk over time, and whether managing cardiovascular health could help.
"Analyzing genetic information alongside years of health records allows us to identify patterns that might not be visible in a smaller or more traditional study," said Guilherme Bauer-Negrini, Ph.D., co-first author and former postdoctoral associate in biomedical data science at Pitt. "With this kind of data, we can start to investigate what may be driving this association and whether any of those factors could be modified to support healthier cognitive aging."
The findings build on a 2022 study from the Pascoal lab that first linked ADHD genetic risk to Alzheimer's-related brain changes in cognitively unimpaired older adults. The new study is the largest to date to combine clinical diagnoses and genetic data within the same population.
Frequently Asked Questions
Q: Does having ADHD mean a person will develop dementia?
A: No. The study found an association, not a guarantee. Pitt researchers said the finding doesn't prove ADHD causes dementia, but the pattern showed up consistently in both medical records and genetic data.
Q: What is a genetic risk score for ADHD?
A: It's a measure of how much a person's common genetic variants are associated with ADHD, regardless of whether they were ever formally diagnosed with the condition. People with the highest scores had a 35% greater chance of developing dementia than those with the lowest scores.
Q: Could early dementia symptoms be mistaken for ADHD, explaining the link?
A: Researchers tested this by requiring at least eight years between an ADHD diagnosis and the onset of cognitive impairment. The association remained significant, making misdiagnosis a less likely full explanation.
Additional Resources
- Convergent clinical and genetic evidence linking ADHD to late-life cognitive impairment | JAMA Psychiatry
- Attention-deficit/hyperactivity disorder and late-life cognitive impairment | EurekAlert!
- Age at Diagnosis and Clinical and Genetic Profiles Among Adults With Attention-Deficit/Hyperactivity Disorder | JAMA Network Open
- Genetic Vulnerability to ADHD Signals Risk of Alzheimer's Disease | UPMC
- Pascoal Lab
- ADHD Causes, Symptoms, and Treatments | UPMC
- Dementia and Cognitive Disorders | UPMC
Authors and Funding
Authors: Tharick A. Pascoal, M.D., Ph.D. (senior author), Douglas Teixiera Leffa, M.D., Ph.D. (co-first author), and Guilherme Bauer-Negrini, Ph.D. (co-first author); Pamela C. L. Ferreira, Ph.D., Bruna Bellaver, Ph.D., Guilherme Povala, Ph.D., Marina S. Medeiros, M.D., Firoza Z. Lussier, M.S., Brooke S. G. Molina, Ph.D., and Dana L. Tudorascu, Ph.D., all of Pitt; Samuele Cortese, M.D., Ph.D., of the University of Southampton; and Luis Augusto Rohde, M.D., Ph.D., of Hospital de Clínicas de Porto Alegre.
Funding and Disclosures: This research was supported by the National Institute on Aging (R01 AG073267, R01 AG075336), the Alzheimer's Association (AARF-D-23-1150249, AARFD-22-923814, AARFD-22-974627, 24AARFD-1243899), the U.K. National Institute for Health and Care Research (NIHR303122, NIHR203684, NIHR203035, NIHR130077, NIHR128472, RP-PG-0618-20003), and the European Research Executive Agency (101095568 HORIZONHLTH- 2022-DISEASE-07-03).
