Atresia of the External Ear Canal.
Congenital Perilymphatic Fistula
Fetal Methyl Mercury Effects
Fetal Iodine Deficiency Effects
Aminoglycoside Antibiotics-streptomycin, Kanamyin, Neomycin, Amikacin, Gentamicin, Tobramicin and Netilmicin
Loop Diuretics, Ethacrynic Acid
Antimalarial (Quinine, Chloroquine)
Immunologic activity within the cochlea may be the cause as suggested by finding of antibodies and response to steroid therapy in many patients. Hearing loss in certain autoimmune diseases is documented.
Systemic Lupus erythomatosus
Direct trauma (temporal bone fracture) or blunt head injury (concussion to labyrinth) can cause SNHL.
Traumatic ear drum Perforation
Skull Fracture (Temporal Bone)
Rock Concerts/Mp3 Players
Occupational Work Noise
Barotraumas is caused by unequalized pressure differentials in middle ear and external ear such as in scuba diving, air traveling or blow to ear. If the pressure is severe, eardrum can rupture.
Barotrauma can cause acquired perilymphatic fistula (communication between inner ear and middle ear) leading to SSNHL and vertigo. Other causes of acquired perilymphatic fistula are direct or indirect trauma to temporal bone, heavy lifting or straining and complication of stapes surgery.
Acoustic Neuroma or Vestibular Schwannoma – SSNHL may be initial manifestation
Temporal Bone Metastases
Neoplasm of CPA or IAC