Background: Cognitive deficits are common in multiple sclerosis (MS) and affect patients at all stages of the disease. regardless of phenotype. Aims: This literature review focuses the cognitive deficits observed in secondary progressive MS (SPMS). It is mainly based on studies that compared the frequency and main characteristics of cognitive deficits in SPMS with other phenotypes. https://allfixelectricales.shop/product-category/gulper-floor-tool/