The goal of this interventional non-pharmacological study is to evaluate the involvement of the autonomic nervous system in patients with relapsing-remitting and primary progressive multiple sclerosis. The main questions it aims to answer are: * Is it possible to define the characteristics of dysautonomia to improve treatment on patients with multiple sclerosis through the management of conditions such as orthostatic hypotension or thermoregulation disorders that inevitably condition the patient's life and the response to rehabilitation ? * Does the severity of the functional alterations correlate with impairment of small somatic and autonomic cutaneous nerve fibers in patients with multiple sclerosis ? * How much the involvement of the autonomic nervous system affects the clinical history and progression of the disease ? * Do different clinical variants of multiple sclerosis manifest with different patterns of involvement of the sensory-autonomic nervous system ? Participants will be hospitalized in Maugeri Clinical Institute of Telese Terme for a rehabilitation treatment. Patients will perform a sensory and autonomic functional study and a morphological analysis of cutaneous nerves through skin biopsy. Researchers will compare results between the two groups (relapsing-remitting and primary progressive) and between patients and data from control subjects.