[Diagnostic controversies on the International Classification of Headaches Disorders, III Edition]

The review considered points of conflict that may lead to confusion in the daily use of the International Classification of Headache Disorders (ICHD-III). Both the controversies at the time of preparing the criteria and the overlaps produced after their use in daily practice were evaluated, argued through scientific bibliography. As relevant points, the anamnesis of a patient with headache should indicate the intensity of the pain as well as the duration of the painful episode and if its location is strictly unilateral. These points may be helpful in cases of moderate pain that do not fully meet the criteria for any of the primary headaches, a frequent dilemma in daily practice.