Relapsing-remitting, where you have
alternating periods of active disease when symptoms flare up and periods when
symptoms fade. This cycle can occur for many years. The disease does not
advance during the remissions.
Secondary progressive, where you first have a relapsing-remitting course and then symptoms become steadily progressive,
with ongoing damage to the
central nervous system. Symptoms usually get worse as
the disease progresses.
Primary progressive is where the disease is progressive from the start, although
damage to the central nervous system occurs at different rates in different
people. This course of MS is not very common.
Progressive relapsing, which is a rare course of MS
that causes steady damage when symptoms first appear and where the
symptoms are progressive at first and are relapsing later.