MS is different in every person. Doctors usually see four forms:
Relapsing-remitting: Symptoms flare during acute attacks, then improve nearly completely or "remit." This is the most common form of MS.
Primary-progressive: MS slowly but steadily worsens.
Secondary-progressive: Begins as relapsing-remitting type, then becomes progressive.
Progressive-relapsing: The underlying disease steadily worsens. The patient has acute relapses, which may or may not remit. This is the least common form of MS.