The purpose of the study is to evaluate the efficacy of the transcranial direct current stimulation of the primary motor cortex (M1) in patients affected by refractory chronic migraine (coded as 1.5.1 in the international headache classification 2nd edition, 2004) and medication-overuse headache (coded as 8.1) with migraine as primary headache.
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Change in headache days per months
Timeframe: at 30, 60 and 90 days after the treatment
Change in drugs intake per months
Timeframe: at 30, 60 and 90 days after treatment