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Table 1 Diagnostic criteria for IIH-related headache according to the International Classification of Headache Disorders (ICHD-3)

From: European Headache Federation guideline on idiopathic intracranial hypertension

A. New headache, or a significant worsening of a pre-existing headache, fulfilling criterion C
B. Both of the following:
1. idiopathic intracranial hypertension (IIH) has been diagnosed
2. cerebrospinal fluid (CSF) pressure exceeds 250 mm CSF (or 280 mm CSF in obese children)
C. Either or both of the following:
1. headache has developed or significantly worsened in temporal relation to the IIH, or led to its discovery
2. headache is accompanied by either or both of the following:
a) pulsatile tinnitus
b) papilloedema
D. Not better accounted for by another ICHD-3 diagnosis