Most people with multiple sclerosis -- around 85% -- have this type. They usually have their first signs of the disease in their early 20s. After that, they have attacks of symptoms (called relapses) from time to time, followed by weeks, months, or years of recovery (called remissions).
The nerves affected by the condition, the severity of the attacks, the degree of recovery, and the time between relapses all vary widely from person to person.