Pseudotumor cerebri affects the body by increasing the intracranial pressure. The cause is not known, but experts think this might happen as a result of too much cerebrospinal fluid around the brain. Too much pressure may then be put on the optic nerve and cause swelling. The swelling could lead to vision impairment and eventually blindness. Some other ways in which the pressure might affect the body include headaches, vision problems, feeling dizzy or nauseous, and ringing in the ears.