Relapsing-Remitting MS (RRMS): this is the most common form of MS affecting about 75%-85% of people who are diagnosed. People living with RRMS will have temporary periods where symptoms flare up, called relapse or new symptoms appear, then the symptoms disappear – this is called remission.
Secondary-Progressive MS (SPMS): with SPMS a person’s symptoms will worsen more steadily over time, with or without relapses and remissions. Before disease-modifying therapies were available 50% of people with RRMS progressed to SPMS approximately 10 years after diagnosis.
Primary-Progressive MS (PPMS): this type of MS is not very common occurring in only 10% of people with MS and is characterised by slowly worsening symptoms from the beginning without any relapses or remissions.
Progressive-Relapsing MS (PRMS): This is a very rare form of MS occurring in 5% of people with MS. Those living with PRMS have steadily worsening symptoms from the beginning with acute relapses and no remissions, with or without recovery.