“…Although the cause of RCVS is not yet fully detailed in the literature, most studies point to a transient dysregulation in the control of brain vessel tone, which results in multifocal vasoconstriction [ 46 , 57 ]. It is known that the control of vascular tone can be affected by several biochemical and immunological factors [ 2 , 58 – 60 ], among which, in scientific evidence, endothelial dysfunction and sympathetic hyperstimulation stand out [ 3 , 10 , 13 , 19 , 20 , 39 , 61 , 62 ] and alteration of vascular smooth muscle by oxidative stress [ 13 , 19 , 20 , 39 , 61 , 63 ]. In addition, genetic predispositions such as Brain-Derived Neurotrophic Factor gene polymorphism [ 58 ] are also described and seem to be associated with more severe clinical conditions [ 13 ].…”