World Brain Day 2021 is dedicated to multiple sclerosis (MS), a neurological disease that affects 2.8 million people of all ages globally. Disease-modifying treatments slow the progression of MS, yet access to these medications is unavailable in many parts of the world. This World Brain Day, let’s work together to stop MS by diagnosing earlier, providing better access to life-changing treatments, and advocating for improved quality of life for those living with MS and their caregivers. Join the World Federation of Neurology (WFN) and the MS International Federation (MSIF) on July 22, 2021, as we share vital information about the signs, symptoms, and treatment of MS.