Etiology
Genetic factors
-autosomal dominant hearing loss -autosomal recessive hearing loss -X-linked hearing loss -Down syndrome (abnormality on a gene) - Usher syndrome (autosomal recessive) - Treacher Collins syndrome (autosomal dominant), - Crouzon syndrome (autosomal dominant) - Alport syndrome (X-linked) |
Other causes of congenital hearing loss
-Intrauterine infections including rubella (German measles), cytomegalovirus, and herpes simplex virus -Complications associated with the Rh factor in the blood -Prematurity -Maternal diabetes -Toxemia during pregnancy -Lack of oxygen (anoxia) -Malformations of the ear |
Acquired hearing loss
-Ear infections (otitis media) -Ototoxic (damaging to the auditory system) drugs -Meningitis -Measles -Encephalitis -Chicken pox -Influenza -Mumps -Head injury -Noise exposure -Other viruses and diseases |