If the health of some people with relapsing-remitting MS does deteriorate after each relapse, but their condition is stable between relapses, this is called ‘worsening relapsing-remitting MS’.
Some people with secondary-progressive MS have relapses, but many do not. In time, people with this condition experience a gradual and continuous increase in symptoms and disability.
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Primary-progressive MS is a progressive form of the disease and does not display any definitive periods of relapse or remission.