Headache attributed to IIH: clinical evolution in IHS criteria through the years.

Idiopathic intracranial hypertension (IIH) is a condition characterized by increased intracranial pressure without a detectable cause. The most common symptom of IIH is a headache, which occurs in almost all cases at the time of diagnosis with various headache phenotypes. In clinical practice, diagnosis of headache attributed to IIH is given referring to the International Headache Society (IHS) criteria of the International Classification of Headache Disorders. In the present publication, we consider how the IHS diagnostic criteria for headache attributed to intracranial idiopathic hypertension have evolved through the years.