Many patients with unsteadiness and/or vertigo are undiagnosable and usually improve with time and most have no physical signs to account for the symptom. Electrocochleography is an objective test for endolymphatic hydrops - and by far the most common cause of endolymphatic hydrops is Ménière's disease. It is a simple test that takes 20 minutes to perform, and though a fine needle is passed through the tympanic membrane it is not unpleasant for the patient. It allows the diagnosis of Ménière's disease to be confirmed or refuted so that appropriate