In any health field, there needs to be standardization in diagnosing. If every doctor used different diagnostic criteria and classifications, there would be total chaos. It would be impossible to communicate with patients, other doctors, researchers, etc. In the field of Migraine disease and headaches, the gold standard for diagnosis and classification is the International Headache Society's International Classification of Headache Disorders, 2nd Edition (ICHD-II).

Questions often arise about...