Progressive relapsing MS (PRMS) is the least common type of multiple sclerosis. It is estimated that only 5% of people with MS have PRMS.
In this uncommon form of MS, people experience both progressive neurological decline and also attacks. PRMS is often misdiagnosed as PPMS until the relapses start.
In addition to the more common MS symptoms, people with PRMS will typically experience a continuous decrease in mobility, with occasional, noticeable attacks such as sudden weakness of an arm or leg, visual disturbance, or sensory symptoms.