Immigrants to Canada who have spent a greater proportion of their lives in Canada have a greater risk of developing multiple sclerosis (MS) than people who have spent a smaller proportion of their lives there, according to a study published in the April 24, 2024, online issue of Neurology(r), the medical journal of the American Academy of Neurology. The study does not prove that an increased proportion of life in Canada causes MS; it only shows an association.