Epilepsy Rates in Older US Adults: New Research Insights

A groundbreaking study published in JAMA Neurology has illuminated the incidence rates of epilepsy among older adults in the United States and identified significant social and environmental factors associated with this neurological condition. Conducted by researchers from the Houston Methodist Research Institute and Case Western Reserve University, this research maps the geographical distribution of epilepsy rates among Medicare beneficiaries aged 65 and older, revealing a strikingly high prevalence in regions known as the 'epilepsy belt'

Understanding the 'Epilepsy Belt'

The analysis highlights notable clusters of high epilepsy rates located primarily in parts of the Southern United States, including:

• Louisiana
• Mississippi
• East Texas
• Central Oklahoma

According to the U.S. Centers for Disease Control and Prevention, epilepsy affects an estimated 3.3 million people in the United States, with healthcare expenditures reaching a staggering $24.5 billion in 2019.

Research Insights

Lead investigator Dr. Weichuan Dong emphasized the importance of this study, stating, “Until now, we didn't have a national picture of where epilepsy affects older adults the most.” By employing advanced geospatial mapping to analyze Medicare data, the research uncovered critical geographic patterns that could impact community strategies for preventing and managing epilepsy.

Key Findings

The study identified several influential factors correlated with high epilepsy incidence:

Climate Change and Health Outcomes

Notably, the study highlighted a novel association between extreme heat and the incidence of epilepsy in older adults. Dr. Siran Koroukian remarked, “This is the first study documenting such a strong association between extreme heat and incident epilepsy, emphasizing the need for emergency preparedness concerning climate change, especially as the population ages.”

Methodology

The research team utilized sophisticated geospatial machine learning algorithms to analyze data from approximately 4.8 million Medicare beneficiaries spanning the years 2016 to 2019. Data was aggregated from the U.S. Medicare Master Beneficiary Summary File and the Agency for Healthcare Research and Quality, though Alaska and Hawaii were excluded due to a lack of comprehensive data regarding social and environmental determinants of health.

Patterns and Predictors

The findings revealed patterns that previously remained hidden within national data. Significant predictors of epilepsy incidence include:

• Obesity Prevalence: Areas with higher rates of obesity were linked to increased epilepsy cases.
• Availability of Primary Care Physicians: Access to healthcare providers directly influences diagnosis and management of epilepsy.

These insights shed light on the complex interplay between environmental factors and health outcomes, urging communities to address the underlying conditions contributing to epilepsy prevalence.

“Understanding where the burden lies is the first step toward uncovering why and helping communities reduce risk.” – Dr. Weichuan Dong

Conclusion

This pioneering research not only maps the incidence of epilepsy among older adults, but also unveils critical determinants influencing health outcomes in the United States. As the population continues to age, integrating the findings into public health strategies will be essential for effective epilepsy management.

Further Reading

For additional details, please refer to the original study: Incidence and Risk Factors of Epilepsy Among Older Adults in the US Medicare Population, JAMA Neurology (2025).

References

• “Discovering America's 'epilepsy belt': Study reveals US regions with high epilepsy rates”. Medical Xpress, November 20, 2025. Link
• Centers for Disease Control and Prevention. (2019). National Overview of Epilepsy.
• U.S. Department of Health and Human Services. (2020). Health Spending Estimates.