Abstract
The Classification of the International Headache Society is an essential tool for medical practice and research, since it is a source of reference and consultation which is necessary for a better understanding of the pathophysiology, for the establishment of differential diagnosis, and for the developement of therapeutic options.
The first edition was based mainly on tbe symptoms of headaches, and in the second edition, updated and based on evidence, more importance was given to the ethiology of headaches and they were classified into two major groups; primary and secondary, which were subdivided into types, subtypes and subforms. This article gives a brief description of the classification and it highlights its clinical and epidemiologyc importance.
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