An exacerbation of MS, also known as a relapse or flare-up, is the occurrence of new symptoms or the worsening of old symptoms. The experience of an exacerbation is varied, they can be mild or severe enough to interfere with functions of daily living and they can last a few days up to several months. While not all people with MS experience relapses, most do. Join Dr. Yohance Allette to learn about exacerbations of MS, as well as what to do when you experience one.