truth, the DOGO just asked whether it is hereditary, not the percent risk for ms. if you do some research you’ll find out it’s true:
“MS also aggregates within some families, and adoption, half-sibling, twin, and spousal studies indicate that familial aggregation is due to genetic, and not environmental, factors (Table 375-1).
REFERENCE: Hauser Stephen L, Goodin Douglas S, “Chapter 375. Multiple Sclerosis and Other Demyelinating Diseases” (Chapter). Fauci AS, Braunwald E, Kasper DL, Hauser SL, Longo DL, Jameson JL, Loscalzo J: Harrison’s Principles of Internal Medicine, 17e: http://www.accessmedicine.com/content.aspx?aID=2906445.
“Up to 20% of patients with MS have another member in their family affected by the disease. The risk of developing MS is 20 to 40 times higher for siblings of affected individuals than in the general population…
Epidemiologic and molecular data indicate that genes play a primary role in determining who is at risk for developing MS.”
REFERENCE: CONTINUUM: Lifelong Learning in Neurology
Issue: Volume 13(5) Multiple Sclerosis, October 2007, pp 63-85