Who is affected by multiple sclerosis

The prevalence of MS varies with:¹

Geographic location. The number of people who have MS increases with distance from the equator. The incidence of MS increases from less than 1 in 100,000 in areas near the equator to 30 to 80 in 100,000 in northern Europe and northern North America. In the southern hemisphere, the increase when moving away from the equator is less dramatic.
Family history. About 15 out of 100 people who have MS have a relative with MS, most often a brother or sister.
Age and sex. MS occurs most often in women, although men also develop this condition. Symptoms rarely first appear at ages younger than 10 or older than 60; most people with MS notice their first symptoms when they are between 20 and 30 years old.

References

Citations

Ropper AH, Brown RH (2005). Multiple sclerosis and allied demyelinative diseases. In Adams and Victor's Principles of Neurology, 8th ed., pp. 771–796. New York: McGraw-Hill.

Credits

Author	Monica Rhodes
Editor	Kathleen M. Ariss, MS
Associate Editor	Denele Ivins
Associate Editor	Pat Truman, MATC
Primary Medical Reviewer	Anne C. Poinier, MD - Internal Medicine
Specialist Medical Reviewer	Colin Chalk, MD, CM, FRCPC - Neurology
Last Updated	February 28, 2008