“Multiple sclerosis (MS) is a potentially disabling disease of the brain and spinal cord (central nervous system.  Eventually, the disease can cause permanent damage or deterioration of the nerves.  Signs and symptoms of MS vary widely and depend on the amount of nerve damage and which nerves are affected. Some people with severe MS may lose the ability to walk independently or at all, while others may experience long periods of remission without any new symptoms.”

MAYO CLINIC