Multiple sclerosis, a progressive autoimmune disorder that affects the central nervous system, usually develops between the ages of twenty and fifty. This guide to multiple sclerosis describes the difference between the four types of the disease and how sufferers can manage their symptoms through medications such as corticosteroids. Though scientists are unsure what causes MS or how to prevent it from flaring up, readers will learn about new research into the genetic factors of the disease that could lead to new gene therapy treatments.