DEAR MAYO CLINIC: What causes multiple sclerosis, or MS, in people who don't have it in their family? ANSWER: The exact cause of MS isn’t known. But it’s clear that a variety of factors can increase a person’s risk of developing this disease. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.