It is more commonin women than men (1.5: 1) and in the age range of 20-40.
It is the leading cause of disability at an early age. The signs and symptoms are multifocal and dispersed, with a course of relapsing and remitting and more rarely with progressive evolution. The duration of outbreaks ranges from 48 hours to days or even weeks, with recess intervals of an indefinite duration. The episodes of relapses may in some cases result in neurological residual signs, the accumulation of which results in the development of physical disability over time.