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Published on: December 9, 2015
[Epidemiology of Multiple Sclerosis: Is Multiple Sclerosis on the Rise?]
1Department of Neurology and Geriatric Medicine, Ehime University Graduate School of Medicine.
Abstract:
Multiple sclerosis (MS) is a worldwide disease with an uneven geographic distribution. There has been a sharp increase in MS prevalence over time almost throughout the world, including Japan. The reasons for the increase in the prevalence of MS are unknown. However, evidence suggests that genetic and environmental factors and their interaction contribute to the etiology of MS. Therefore, the increase in prevalence can be attributed in part to a greater exposure to certain environmental risk factors in genetically susceptible individuals and also to increased survival rates and improved assessment. To clarify whether the increase in MS prevalence reflects a real increase in disease frequency, it is essential to assess temporal and geographical differences in MS incidence and to compair incidence in different ethnic populations. However, epidemiological data on incidence are limited, and there are marked geographical disparities in available data, most of which were obtained from studies in Europe and North America. In addition, there are marked variabilities in methodology, objectives, and study periods. Further epidemiological studies with appropriate standardization are needed to determine whether the risk of MS has changed over time.
Insights
Multiple sclerosis (MS) prevalence is rising globally, potentially due to environmental factors and improved diagnostics. Further research is needed to understand geographical and temporal trends in MS incidence.
Area of Science:
- Neurology
- Epidemiology
Background:
- Multiple sclerosis (MS) exhibits a worldwide, uneven geographic distribution.
- A notable increase in MS prevalence has been observed globally, including Japan.
- The exact causes for the rising MS prevalence remain undetermined.
Purpose of the Study:
- To investigate the real increase in disease frequency versus other factors contributing to rising MS prevalence.
- To assess temporal and geographical differences in MS incidence.
- To compare MS incidence across different ethnic populations.
Main Methods:
- Review of existing epidemiological data on MS incidence.
- Analysis of geographical disparities in available MS data.
- Consideration of methodological variations in previous studies.
Main Results:
- Epidemiological data on MS incidence are limited.
- Significant geographical disparities exist in current MS data, with most studies from Europe and North America.
- Variability in study methodologies, objectives, and time periods complicates data interpretation.
Conclusions:
- The increase in MS prevalence may be influenced by environmental factors, genetic susceptibility, improved survival rates, and better assessment.
- Standardized epidemiological studies are crucial for accurately determining changes in MS risk over time.
- Further research is essential to clarify the true incidence trends and risk factors for multiple sclerosis globally.
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