The annual incidence of idiopathic intracranial hypertension (IIH) in the US is 0.9/100,000 persons, and 3.5/100,000 in females aged 15 to 44 years. Among obese women aged 20 to 44 years who are ≥20% over their ideal weight, the incidence is 19/100,000. More than 90% of patients are obese, and >90% are women of childbearing age. Female preponderance and the association of obesity is true only for post-pubertal patients. The mean age at diagnosis is about 30 years. Idiopathic intracranial hypertension occurs throughout the world, with an estimated incidence of 1 to 3 per 100,000 population per year. One crude annual incidence rate in Libya found idiopathic intracranial hypertension to be 2.2/100,000 and 21.4/100,000 in obese females aged 15 to 44 years. In the Idiopathic Intracranial Hypertension Treatment Trial (IIHTT), a US-based randomised controlled study involving 165 subjects with IIH and mild visual loss, all subjects were overweight, most were obese (88%), and most were female (98%).
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