Cluster headache. Premonitory symptoms.

The emergence of symptoms which may precede by days the onset of a series of painful attacks of cluster headache is not often reported in the medical literature. In this report, four patients who described these premonitory symptoms are presented. The importance of premonitory symptoms is emphasized, for they provide a means to institute an early prophylactic therapy and the possibility of clarifying the physiopathology of this primary headache.