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History of delayed endolymphatic hydrops in original publications by Kamei et al., Wolfson and Leiberman, Nadol et al. and Schucknecht's group.

In 1971, Kamei et al. reported that delayed onset of episodic vertigo of the Meniere’s type was caused by preexisting profound hearing loss of unknown cause from early childhood. In 1975, Wolfson and Leiberman and Nadol et al. separately described that profound hearing loss caused by viral and bacterial infections, sudden deafness, and head trauma could also be fol-lowed by delayed episodic vertigo. In 1978, Schuknecht described delayed endolymphatic hydrops (DEH) as a disease entity. He also pointed out that there were two types of DEH, namely, the ipsilateral and contralateral types. In 2017, new diagnostic criteria for DEH were proposed by the Japan Society for Equilibrium Research. Based on these criteria, patients with DEH can now apply for medical subsidy in the new system of intractable diseases specified by the Japanese government.