[Cognitive Impairment in Multiple Sclerosis].

Cognitive impairment is one of the major symptoms of multiple sclerosis (MS) and one that often remains unnoticed. An adequate battery should be used to evaluate cognitive function in patients with MS because cognitive impairment in MS typically involves specific deficits such as sustained attention and information processing speed rather than global cognitive decline. Cognitive impairment could influence patients' daily and social activities. It is not easy to improve cognitive impairment in patients with MS, and it is important to prevent the decline of function using disease-modifying drugs for MS.