The cause of MS is still undetermined, but it is known that the myelin sheath, the coating around the nerve fibres in the brain and spinal cord, is affected.
Myelin aids in 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 may have one or two attacks and then be symptom-free for the rest of their lives. Others may have a slowly progressive course with no remissions.it is most often diagnosed in those aged 20 to 40 although it has been found in people younger and older. The average age of diagnosis is 30. Three women have MS for every two men.