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Few studies have investigated personality characteristics in people with multiple sclerosis (MS), and little is known about the relationship between personality and clinical characteristics in these patients. We aimed to investigate the personality traits of MS patients and their relationship with clinical characteristics. The study population consisted of 74 MS patients and age-matched, sex-matched, and education level-matched healthy controls. All participants were instructed to complete the self-administered 240-item Temperament and Character Inventory and the Beck Depression Inventory. The MS patients exhibited higher harm avoidance (HA) and lower self-directedness scores than the control group, although these differences disappeared after controlling for depression. Duration of the disease was positively correlated with HA and negatively correlated with novelty-seeking scores. Expanded Disability Status Scale scores were negatively correlated with reward dependence. Our results suggest a possible relationship between personality characteristics and the stage of the disease or the degree of damage in MS patients.

Our study suggests that the deficits in executive function may be endophenotypic markers of genetic vulnerability to BD I.