The frequency of migraine attacks is not used as a diagnostic criterion, however, it is a very important factor in the evaluation of migraine severity and its treatment. Several studies report the frequency of migraine attacks using the International Headache Society criteria. No investigator, however, has reported daily migraine attacks.
In the current report, we present five patients whose headaches transformed from episodic migraine to daily migraine with aura. To the best of our knowledge, this is the first description of this variant of migraine. The symptoms in all the patients described comply strictly with the International Headache Society criteria for the diagnosis of migraine with typical aura.
An interesting additional observation concerns the beneficial effect of phenytoin, a drug that has not proved to be effective in migraine but showed some efficacy in our patients.