<unk>  makes all sounds seem faint or muffled. The hearing loss is usually worse in lower frequencies. Congenital<unk>  is identified through newborn hearing screening or may be identified because the baby has microtia or other facial abnormalities.<unk>  developing during childhood is usually due to otitis media with effusion and may present with speech and language delay or difficulty hearing. Later onset of<unk>  may have an obvious cause such as an ear infection, trauma or upper respiratory tract infection or may have an insidious onset related to chronic middle ear disease, otosclerosis or a tumour of the naso-pharynx. Earwax is a very common cause of a<unk>  which may present suddenly when the wax blocks sound from getting through the external ear canal to the middle and inner ear.
Conductive hearing loss
Sensorineural hearing loss
Spatial hearing loss
Prelingual deafness
Unilateral hearing loss
Cortical deafness
Auditory exclusion
Noise-induced hearing loss