This cycle can repeat for many years before secondary progressive MS develops.

Natalizumab has shown efficacy and has been approved for secondary progressive MS with relapses.

For Mimi Mosher, a person with primary progressive MS, clarity first came when she lost her vision.

As her primary progressive MS forced her to hand over her car...

The median time between disease onset and conversion from relapsing-remitting to secondary progressive MS is 19 years.

People with primary progressive MS are usually older at the time of diagnosis - an average age of 40.

Perhaps the most upsetting difference in primary progressive MS is its poor response to treatment.

People with incomplete recovery from initial relapses generally convert to secondary progressive MS sooner than those who recover completely.

Secondary progressive MS is challenging to treat - and to live with.

Medicines used to treat and possibly delay the progression of secondary progressive MS that is also relapsing include: