Epilepsy Linked To Higher Risk Of Young-onset Dementia

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A study published in Neurology found that epilepsy was associated with a higher likelihood of young-onset dementia, diagnosed before age 65. In a French follow-up analysis, the adjusted likelihood was six times higher for people newly diagnosed with epilepsy than for people without epilepsy, although the absolute share who developed dementia was low. The study does not show that epilepsy causes dementia.

A study published October 14 in Neurology found that people with epilepsy were more likely to have or later develop young-onset dementia, diagnosed before age 65, than people without epilepsy. The researchers said the results show an association, not that epilepsy directly causes dementia, and noted that the absolute risk remained low in the follow-up analysis.

The research used two approaches and national health data from France and Sweden. In the first, researchers compared people diagnosed with young-onset dementia with people of the same age and sex who did not have dementia, then examined records for earlier epilepsy diagnoses or prescriptions for epilepsy medicines. The French comparison included 11,360 people with dementia and 113,600 people without it; the Swedish comparison included 16,433 and 164,330 people, respectively.

In France, 12.5% of people with young-onset dementia had an epilepsy diagnosis, compared with 1.2% of those without dementia. Epilepsy medicines had been prescribed to 27.3% of the dementia group and 10.3% of the comparison group. The report said similar patterns appeared in Sweden. These figures describe the proportions in the study groups; they do not establish that epilepsy or its treatment caused dementia.

The second analysis followed French adults aged 30 to 55 for up to 10 years. It included 12,901 people newly diagnosed with epilepsy, 64,083 with existing epilepsy and 129,010 people 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 likelihood of young-onset dementia compared with no epilepsy; existing epilepsy was associated with a 74% higher likelihood.

Implications for Epilepsy Care

The findings add evidence about a possible connection between epilepsy and dementia diagnosed before age 65, an area the study authors said has had less research than the link with later-onset dementia. The results may prompt attention to cognitive health as part of epilepsy care, but they do not establish that every person with epilepsy faces a high risk or will develop dementia.

Study author Vincent Navarro of Sorbonne University said the findings support integrating dementia prevention into care for people with epilepsy. He suggested that patients could benefit from earlier assessment of cognitive risks and stronger management of modifiable factors, including high blood pressure. The study did not test whether these steps prevent dementia, so that implication should be understood as a proposed direction for care rather than a proven outcome.

The absolute percentages in the follow-up analysis also help put the relative association in perspective: dementia was recorded in 2.2% of people newly diagnosed with epilepsy over the study period, compared with 0.2% of those without epilepsy. Those numbers are specific to the study’s population and follow-up, not an individual prediction.

How Researchers Compared Risk

The researchers combined a look-back comparison with a follow-up analysis. In the first, records of people with young-onset dementia were compared with records of age- and sex-matched people without dementia to see whether epilepsy diagnoses or epilepsy-drug use had appeared in the preceding years. In the second, researchers followed people in France after an epilepsy diagnosis and compared dementia outcomes with those in groups with existing epilepsy or no epilepsy.

Using both methods allowed the team to examine the association from different directions: whether epilepsy appeared more often in records before a dementia diagnosis, and whether dementia diagnoses accumulated during follow-up among people with epilepsy. The study was supported by the French National Research Agency and published in the American Academy of Neurology journal Neurology. Its reported findings apply to the records and populations studied; they do not, by themselves, explain the biological reasons for the association.

Limits of the Evidence

The study shows an association, not causation. It cannot establish whether epilepsy contributes to dementia, whether other processes contribute to both conditions, or whether factors not captured in the records help explain the relationship. Adjusting for several known risk factors does not remove every possible source of bias or confounding.

The researchers lacked detailed information about the types and causes of dementia and the types of epilepsy among participants. The study also relied on health-system data from France and Sweden, both high-income countries with universal health coverage. The authors said the results may not apply in settings with different health systems or populations. The report does not provide evidence that treating epilepsy, taking or stopping epilepsy medication, or changing a particular risk factor will prevent dementia.

Questions for Further Research

The study establishes an association that researchers can investigate further, but the supplied report does not announce a planned follow-up study or a change to clinical guidelines. Future research would need to clarify whether the relationship varies by epilepsy or dementia subtype, and how much it is shaped by shared risk factors or other explanations.

For now, Navarro’s comments point to earlier attention to cognitive risks and management of modifiable health factors as considerations for epilepsy care, not as a guarantee of prevention. The study offers no individual risk assessment. People with questions about their epilepsy treatment or cognitive health should discuss them with a qualified health professional rather than make treatment changes based on these findings alone.

Key Questions

What is young-onset dementia?

It refers to dementia that develops before age 65. The study examined this age-defined group, rather than dementia diagnosed later in life.

Does epilepsy cause young-onset dementia?

The study does not establish that epilepsy causes dementia. It found an association in health records, and other factors or explanations may contribute.

How common was dementia in the follow-up groups?

Over up to 10 years, young-onset dementia was recorded in 2.2% of people newly diagnosed with epilepsy, 1.7% of people with existing epilepsy and 0.2% of people without epilepsy in the French analysis.

What did the researchers suggest for epilepsy care?

Study author Vincent Navarro said the findings support attention to cognitive risks and modifiable factors, such as high blood pressure. The study did not test whether those steps prevent dementia.

Can the results be applied to everyone with epilepsy?

Not with certainty. The study used national data from France and Sweden, and the authors noted that the results may not apply to other settings. It also lacked detailed information about epilepsy and dementia types.

Source: rss