A survey of 265 Japanese patients with Meniere's disease revealed bilateral involvement in approximately 29% of all these patients. Somatic and psychiatric aspects of bilateral Meniere's disease were as follows. (1) The duration of the disease in cases of bilateral involvement was significantly longer than cases of unilateral involvement. (2) An abnormal general condition, a more extensive degree of hearing loss and neurotic type were frequently diagnosed in cases of bilateral involvement. Based on these results, it was concluded that psychiatric management and prevention of aggravation of deafness should be part of the management of treatment in bilateral Meniere's disease.