How long can a relapse last for...days, weeks, months?
80% of people reach maximal deficits from a relapse in 2 weeks and 90% within 4 weeks. This is followed by a variable period of stability, usually a few days to 2 weeks, followed by slow improvement to a new baseline state with or without residual problems from the relapse. 80% of people reach maximum recovery within 3 months and 90% within 6 months. The rest can take up to a year to recover, although we now know that recovery can continue beyond a year if the underlying disease is thoroughly controlled.
Revere (Rip) Kinkel MD
Director of the Multiple Sclerosis Program
Professor of Clinical Neurosciences
University of California San Diego