Relapsing-remitting multiple sclerosis progresses by relapse. It is therefore necessary to know how to identify this phenomenon in order to be able to provide the best possible support to patients. The term "relapse" is used to characterize the period of a few days to a few weeks during which an attack of inflammation of the myelin occurs. Depending on the area affected, the symptoms will be different. To qualify as a relapse, the patient must have had new, permanent symptoms for at least 24 hours without fever or signs of infection and within 30 days of the last relapse.