[Intellect and mood disorders in multiple sclerosis].

Recent studies showed that mild or moderate cognitive deficits and affective disturbances are frequent in patients with multiple sclerosis and can be found early in the course of the disease. Cognitive deficits are related to brain lesions but not clearly to functional disability. Affective disturbances are partly determined by the presence of brain involvement, but also by an emotional reaction to the disorder. Psychological disorders must be taken in account for a better management of the patients and their family.