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A study published October 14 in Neurology found that epilepsy was associated with a higher risk of young-onset dementia, diagnosed before age 65. In a French follow-up analysis, newly diagnosed epilepsy was linked to six times the adjusted risk compared with no epilepsy, although the absolute risk remained low and the study cannot establish causation.
People with epilepsy were more likely to have or develop young-onset dementia than people without epilepsy in a study published October 14 in Neurology, the medical journal of the American Academy of Neurology. The findings, based on national data from France and Sweden, show an association, not proof that epilepsy directly causes dementia diagnosed before age 65.
The researchers used two approaches. In analyses in both countries, they compared people diagnosed with young-onset dementia with people of the same age and sex who did not have dementia, then examined earlier records for epilepsy diagnoses or epilepsy medication use. France’s group included 11,360 people with dementia and 113,600 comparison participants; Sweden’s included 16,433 people with dementia and 164,330 comparison participants. The report said the results were similar in the two countries.
In France, 12.5% of people with young-onset dementia had an epilepsy diagnosis, compared with 1.2% of those without dementia. Epilepsy medications had been received by 27.3% of the dementia group and 10.3% of the comparison group. Medication use is not itself proof of an epilepsy diagnosis, and these retrospective comparisons do not establish which condition came first or explain the relationship.
The second analysis followed French adults aged 30 to 55 over as long as 10 years. It included 12,901 people newly diagnosed with epilepsy, 64,083 with existing epilepsy and 129,010 without epilepsy. Young-onset dementia was diagnosed in 2.2% of the newly diagnosed group, 1.7% of those with existing epilepsy and 0.2% of those without epilepsy. After adjustment for factors including stroke, mood disorders and traumatic brain injury, newly diagnosed epilepsy was associated with six times the risk of the no-epilepsy group; existing epilepsy was associated with a 74% higher risk.
What the Risk Findings Mean
The findings may matter for how clinicians consider cognitive health in epilepsy care. Study author Vincent Navarro of Sorbonne University in Paris said the results support integrating dementia prevention into care, including earlier assessment of cognitive risks and closer management of modifiable factors such as high blood pressure. Those are implications offered by the researchers; the study did not test whether screening or risk-factor management prevents dementia in people with epilepsy.
The relative-risk figures need to be read alongside the absolute rates. In the French follow-up, 2.2% of people newly diagnosed with epilepsy developed young-onset dementia during up to 10 years, compared with 0.2% of those without epilepsy. Navarro said the absolute risk remains low. The results do not mean that most people with epilepsy will develop dementia, nor do they predict an individual person’s outcome.
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How Researchers Compared Cases
Young-onset dementia, also called early-onset dementia, refers to dementia that develops before age 65. Previous research had linked epilepsy with late-onset dementia, but the report says evidence focused on young-onset dementia was limited. The new work addresses that gap through both retrospective comparisons and a separate follow-up analysis.
The study, “Association between epilepsy and young-onset dementia,” was published in Neurology and supported by the French National Research Agency. The retrospective analyses examined records for up to 10 years before dementia diagnosis. The French follow-up instead began with people newly diagnosed with epilepsy in 2008 and tracked diagnoses over time, allowing the researchers to report later dementia rates in those groups.
Limits of the Available Evidence
The study shows an association, not a direct cause. The researchers adjusted the French follow-up analysis for several factors that could affect dementia risk, but the results cannot establish why the conditions are linked or rule out all other explanations. The report also does not show that epilepsy treatment changes the risk.
Researchers lacked detailed information about the types and causes of dementia and the types of epilepsy involved. The data came from France and Sweden, both high-income countries with universal health coverage, so the findings may not apply in other health systems or populations. The report does not provide enough detail to determine whether the association varies by epilepsy type, dementia subtype or individual characteristics.
Questions for Future Research
The study report does not announce a planned follow-up trial or a change to clinical guidance. Further research would be needed to clarify the mechanisms behind the association, test whether it appears across different epilepsy and dementia types, and determine whether particular prevention or monitoring strategies improve outcomes.
For now, the authors’ stated implication is that clinicians may consider cognitive risks and modifiable health factors as part of epilepsy care. The findings alone do not establish a new screening schedule or treatment recommendation; how they should affect practice remains to be determined.
Key Questions
What counts as young-onset dementia?
In this report, young-onset dementia means dementia that develops before age 65. It is also sometimes called early-onset dementia.
Does epilepsy cause young-onset dementia?
The study does not prove that epilepsy causes dementia. It found an association in population data, and the reasons for that relationship remain unclear.
How many people with newly diagnosed epilepsy developed dementia?
In the French follow-up, 2.2% of people newly diagnosed with epilepsy developed young-onset dementia over as long as 10 years. The comparable figure was 0.2% among people without epilepsy.
Does the study mean most people with epilepsy will develop dementia?
No. The absolute rate in the newly diagnosed epilepsy group was 2.2% over up to 10 years. Study author Vincent Navarro said the absolute risk was low; the relative-risk comparison does not mean most people with epilepsy will develop dementia.
Can these results be applied everywhere?
It is not clear. The data came from France and Sweden, and the authors said findings may not apply to other settings. The study also lacked detailed information about dementia and epilepsy subtypes.
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