Disease Database Drug Database Alt. The MS Society of Canada Multiple sclerosis is the most common disease of the central nervous system affecting young adults in Canada. It is estimated that approximately 50,000 men and women in Canada have the disease. Myelin is important to the transmission of nerve impulses through nerve fibres. MS varies greatly from person to person and in the severity and the course of the disease.
Some people have few attacks and little disability over time.
Secondary progressive MS begins with a series of relapses and recovery but becomes steadily progressive over time with continued worsening. Most people with MS have relapsing-remitting or secondary progressive. Multiple sclerosis is a disease that develops in young adulthood. It is most often diagnosed in those aged 20 to 40 although it has been found in people younger and older. The average age at diagnosis is 30.