Your MS medications are designed to prevent flare-ups, but you can still get some that sometimes can interfere with your ability to get around. Mild flare-ups will eventually go away on their own, so if they're not bothering you, you don't need to treat them. On the other hand, if a flare-up gets in the way of your life, your doctor may give you high-dose steroids through a vein (intravenously) or by mouth to make the relapse go away more quickly. Steroids won't slow down the course of your overall disease, though.