Pseudo tumor cerebri (SOO-doh-too-mur SER-uh-bry) is a term that describes an increase of pressure inside your skull that happens for no obvious reason. Symptoms are similar to those of a brain tumor but there is no tumor. Symptoms may include a headache behind your eyes, ringing in your ears, nausea, vomiting, dizziness, blurred vision or double vision. The cause of pseudo tumor cerebri is unknown, but it is thought to be linked to an excess amount of cerebrospinal fluid within your skull. Some people can become blind as a result of the increased pressure in their skulls. If you have symptoms, you should see your doctor to rule out a brain tumor and to treat your symptoms.