Inclusion criteria  Be of legal age Have a confirmed MS according to the McDonald criteria 2017 Have the date of onset of the disease recorded in EDMUS Have a disease onset date after 1 January 2009  For patients receiving treatment for their MS*: have the date of first disease- modifying therapy entered in EDMUS  Patients not receiving treatment for their MS can be included if they meet the other criteria  Exclusion criteria  • Being deprived of liberty or under guardianship