A therapeutic method completely opposite to the known basic therapeutic policy including restriction of water and salt intake, which has been hitherto designated as the therapeutic method for Meniere's disease, and is a therapeutic method for endolymphatic hydrops associated diseases by performing water intake therapy for the patient with strongly suspected Meniere's disease from the initial stage of disease. For preventing vertiginous attack and hearing loss by performing patient compliance instruction for proper intake of water and maintaining plasma AVP at low level: sufficient water intake and short term administration of osmotic diuretic in the patient are performed; plasma osmotic pressure is maintained at the lowest limit of the normal level; secretion of AVP from the pituitary grand is minimized; proper activity of AQP2 in the inner ear is maintained; influent of water into the endolymph is decreased; and prevention of vertiginous attack and improvement of hearing are performed.
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