The etiologies were ototoxicity (n = 11), infection (neuritis n = 1, meningitis n = 3, Lyme’s disease n = 1, herpes infection n = 1), hereditary (DFNA9 gene mutation n = 3, other n = 2), congenital n = 1, Menière’s disease (n = 3), auto-immune (n = 2), renal failure (n = 1), and idiopathic (n = 21, of which 9 reported a migraine history). Here, COCH is linked to Lyme disease.