Hearing loss, also known as hearing impairment, is a partial or total inability to hear.A deaf person has little to no hearing. Hearing loss may occur in one or both ears.[ In children, hearing problems can affect the ability to learn spoken language and in adults it can create difficulties with social interaction and at work.[6] In some people, particularly older people, hearing loss can result in loneliness.[2] Hearing loss can be temporary or permanent. Hearing loss may be caused by a number of factors, including: genetics, ageing, exposure to noise, some infections, birth complications, trauma to the ear, and certain medications or toxins. A common condition that results in hearing loss is chronic ear infections.[2] Certain infections during pregnancy, such as cytomegalovirus, syphilis and rubella, may also cause hearing loss in the child.Hearing loss is diagnosed when hearing testing finds that a person is unable to hear 25 decibels in at least one ear. Testing for poor hearing is recommended for all newborns.[6] Hearing loss can be categorized as mild (25 to 40 dB), moderate (41 to 55 dB), moderate-severe (56 to 70 dB), severe (71 to 90 dB), or profound (greater than 90 dB).[2] There are three main types of hearing loss: conductive hearing loss, sensorineural hearing loss, and mixed hearing loss
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