Migraine psychosis is the most severe form of dysphrenic migraine. Symptomatology and a recently proposed classification are described.

Attention is payed to the associated disturbances of consciousness and memory. A case of migraine psychosis is presented. In relation to this case the hypothesis is put forward that the acoustic hallucinations in migraine psychosis are due to cortical excitation of the primary and secondary projection area of the left temporal lobe. A case of migraine psychosis, described by Féré in 1897, is reviewed and understood in terms of cortical excitation of the secondary visual projection area of the left occipital lobe.

Attention is payed to the presumed rare incidence of migraine psychosis and to the possibility that its frequency of occurence may be higher than at present is assumed. The importance of a rationally based pharmacological treatment is emphasized.