Inclusion Criteria:  Multiple sclerosis defined according to McDonald criteria; Already undergone or beginning substantive treatment (self-managed, excluding treatment administered in hospital) Aged ≥ 18 years; Given the informed consent form.  Exclusion Criteria:  Severe cognitive impairment (score below the 5th percentile); Any associated neurological pathology or serious or chronic somatic disease (cancer); Being under a legal protection measure.