The authors reviewed medical records of 82 patients with idiopathic intracranial hypertension (IIH) to determine the frequency of headaches occurring after initial diagnosis and treatment of IIH, classifiable by the International Headache Society guidelines. Sixty-eight percent of patients had definable headache disorders, including episodic tension type headache (30%) and migraine without aura (20%). Patients with IIH frequently have other types of headaches, not necessarily related to increased intracranial pressure.