Multiple sclerosis (MS) is a leading cause of disability in young adults, carrying a considerable individual and societal economic burden. The development of disease-modifying therapies and updates to diagnostic criteria are leading us into a new era for MS management, both in the earliest disease phases and progressive MS. In this completely revised/fully updated edition of Fast Facts: Multiple Sclerosis, we present the most recent evidence on disease pathogenesis and all clinical aspects of the condition, as well as the latest on disease-modifying therapies and other potential treatments. Given the need for multidisciplinary management of MS, we have written this resource for the benefit of all health professionals involved in MS care.