Multiple sclerosis (MS)is a disorder of the nerve fibres within the brain, the spinal chord and going to the eye. It can affect vision, sensation, the use of limbs and control of passing urine (incontinence).
It usually starts between the ages of 20 and 40 years, often initially causing blurred vision. It is more common in women. The illness is usually a long one with years of tempory improvement but often overall increasing disability, and eventually many years spent in a wheelchair.
Multiple sclerosis caused 0.03% of all deaths worldwide in 2002, an average of 3 deaths per million people per year.