Reframing Multiple Sclerosis as a Spectrum of Progression

<p>This academic review proposes a <strong>unified spectrum model</strong> for multiple sclerosis (MS) that challenges traditional, rigid phenotype classifications like RRMS, SPMS, and PPMS. The authors argue that disability often accumulates through <strong>progression independent of relapse activity (PIRA)</strong> and "smouldering" disease processes, which frequently occur silently long before a formal progressive diagnosis. By integrating the role of <strong>neurologic reserve</strong> and biological ageing, the text explains how the clinical transition to progressive states reflects a <strong>declining capacity to compensate</strong> for ongoing tissue injury rather than a brand-new disease mechanism. This shift toward a <strong>biology-aware framework</strong> aims to facilitate earlier recognition of worsening and move treatment strategies beyond a simple focus on suppressing acute relapses. Ultimately, the source advocates for <strong>longitudinal, multidimensional monitoring</strong> to better address the continuous pathological evolution that shapes long-term neurological decline across the entire MS continuum.</p>