Bilateral hearing loss. A 28-year-old woman visited our clinic with bilateral hearing loss. She had poor hearing since childhood. There was no previous history of infection or trauma, and there were no other medical symptoms. She had no family history of hearing loss. On otoscopy, both eardrums were normal. On the patient’s first visit to our clinic, laboratory test results were within the normal ranges. Temporal bone CT showed normal middle ear and ossicular chain. As per pure tone audiometry, the air-conduction threshold was 50 dB on the right and 45 dB on the left, and bilateral conductive hearing loss was found, showing a 40 dB air-bone gap. The speech discrimination scores on both sides were 92% each.