Basilar migraine has been studied by Bickerstaff who considers that there is a vasoconstriction in the basilar territory resulting in transient ischemia with the corresponding neurological symptoms including vertigo, and followed by the vasodilatation causing the headache. Three cases, treated in neurology, have had an audiovestibular investigation with an E.N.G. and an audiogram and are described herein. Nystagmus and hearing loss have been observed in one of these cases and it is suggested that the internal auditory artery participates in the basilar migrainous processes. The diagnosis of basilar migraine is impossible to prove and the investigation is very limited. Finally it is the evolution of the patient which helps in establishing the diagnosis of basilar migraine.