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The second phase of Multiple Sclerosis.
Secondary-Progressive MS is a steadily downhill experience, with symptoms getting worse over time, with or without relapses (temporary flare-ups or worsening of symptoms) or remissions (temporary lessening in the severity of symptoms). Many patients progress into SPMS over time, often after being diagnosed with Relapsing-Remitting MS, which is mainly comprised of surprise flare-ups of symptoms.