- Relapsing-Remitting MS (RRMS): Characterized by clear attacks of new or worsening neurological symptoms followed by periods of partial or complete recovery.
- Secondary-Progressive MS (SPMS): Initially presents as RRMS but eventually transitions to a progressive form with steady worsening of symptoms.
- Primary-Progressive MS (PPMS): Characterized by steadily worsening symptoms from the onset without initial relapses.
- Progressive-Relapsing MS (PRMS): The rarest form, involving steady progression of symptoms with occasional acute relapses.