Without treatment, Secondary-progressive MS, formerly called chronic progressive MS, develops within 10 years in about 50% of people who have had relapsing-remitting MS.
Some people with secondary-progressive MS have relapses, but many do not. In time, people with this condition experience a gradual and continuous increase in symptoms and disability.
Fifteen years after being diagnosed with Secondary-progressive MS, some people may require walking aids, such as a cane, and others may need use of a wheelchair.
