Normal pressure pseudotumor cerebri is a medical condition that causes increased pressure inside the skull, leading to symptoms such as headache, vision changes, and ringing in the ears. Other terms that can be used interchangeably with normal pressure pseudotumor cerebri include idiopathic intracranial hypertension, benign intracranial hypertension, and pseudotumor cerebri syndrome. The word "idiopathic" means that the cause of the condition is unknown, "benign" means that it is not cancerous, and "syndrome" refers to a collection of symptoms that occur together. Physicians may use any of these terms to diagnose and treat the condition.