With relapsing-remitting MS, flare-ups can bring new symptoms or make ones you already have worse. They come on suddenly over 24 hours and get better slowly over weeks or months. They may never totally go away.
These happen because part of your central nervous system gets inflamed. The inflammation slows or disrupts nerve signals. That brings things like numbness, pain, and dizziness.
Usually, people don’t know what triggered the flare-ups.