Chronic migraine classification: one more attempt of optimization and criteria revision.

The authors comment on an article on chronic migraine (CM) classification. They offer an opinion on the revision of the 2nd edition of the International Headache Classification (ICHD-2) for migraine suggested by the authors of the paper and proposes new revision of CM diagnostic criteria for ICHD-3. They believe that since the term CM absorbs the term transformed migraine (TM), CM diagnostic criteria should also absorb all or some of the most prominent diagnostic criteria of TM.