Though many people experience nausea and pressure headaches, in rare cases, an ophthalmologic condition — papilledema — is the cause. Papilledema occurs when the optic disc and the optic nerve at the back of the eyeball become swollen.
The swelling of the optic disc and nerve that causes papilledema is related to increased intracranial pressure, rather than inflammation. The condition rarely occurs on its own; it is usually a symptom of an underlying condition. In most cases, it occurs in both eyes at the same time.
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