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Although central nervous system dysfunction frequently occurs in fibromyalgia (FM) patients, proprioceptive [nerve ending] disturbances might also explain some of the abnormalities observed. Rosenhall et al (1996) reported that 72% of 168 FM patients studied suffered from vertigo/dizziness, 15% were afflicted with sensorineural hearing loss, 30% had evidence of brainstem dysfunction, 28% had abnormal saccades and 58% had pathological smooth pursuit eye movements in oculomotor studies, and 45% had a pathological electronystagmography [method of recording muscle activity outside the eye.] On the other hand, Heller et al (1998) reported that 28% of 80 patients with sudden deafness and progressive hearing losses displayed symptoms typical for FM and CFS disorders, including fatigue, myalgia, arhtralgia, depression, sicca symptoms, and diarrhea.
(Source: The Concise Encyclopedia of Fibromyalgia and Myofascial Pain, by Roberto Patarca-Montero, M.D., Ph.D.)