Multiple sclerosis (MS) is a chronic, progressive disease with a high prevalence in France, and its consequences in terms of public health are important. In this disease, the alteration of the quality of life (QoL) is constant and multifactorial : pain, fatigue, decrease in functional capacities, sleep disorders, cognitive disorders, vesico-sphincterian disorders, anomolytic disorders. -rectal and genito-sexual. The benefit of thermal cures on the quality of life in this population has not been evaluated, even if there is some literature in the literature suggesting a benefit of hydrotherapy on equilibrium or on pain.