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Is multiple sclerosis more common in certain parts of the world?

ANSWER

Studies show that it is, but if you move from an area with higher risk to one of lower risk, you acquire the risk of your new home if the move happens before adolescence. This suggests exposure to something in the environment before puberty may make MS more likely. In both hemispheres, the prevalence or MS rises the farther you are from the equator. There have been MS "epidemics." One happened in people living off the coast of Denmark after WWII, suggesting an environmental cause.

SOURCES:

National Multiple Sclerosis Society: "What causes MS?"

Mayo Clinic: Multiple sclerosis: "Causes."

Multiple Sclerosis Foundation: "What Causes Multiple Sclerosis?"

Reviewed by Christopher Melinosky on August 26, 2019

SOURCES:

National Multiple Sclerosis Society: "What causes MS?"

Mayo Clinic: Multiple sclerosis: "Causes."

Multiple Sclerosis Foundation: "What Causes Multiple Sclerosis?"

Reviewed by Christopher Melinosky on August 26, 2019

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Are there other factors besides the environment and genetics that can cause multiple sclerosis?

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