About Hearing Loss

How does the degree of hearing loss affect what people can hear?

People can have varying degrees of hearing loss, which can be determined by visiting an audiologist. Hearing loss is measured in decibels: the greater the decibel level, the louder the sound. People who have standard or typical hearing can hear sound at a loudness or intensity of zero to 15 decibels.

Find out how hearing loss affects what you can hear unaided - without hearing aids or cochlear implants - with the Degrees of Hearing Loss Chart.

What are some of the indicators and causes of hearing loss?

For 50 percent of all newborns with hearing loss, the cause is unknown or unidentifiable. In 25 percent of all cases, hearing loss is linked to risk factors such as prenatal infections, low birth weight, mechanical ventilation and other causes. The remaining 25 percent of all cases of hearing loss are caused by genetic factors. In addition, older children may develop hearing loss due to childhood illness or trauma

Children who have one or more of the following indicators for hearing loss may have a better than average chance of having a hearing loss.

Prenatal and Early Infancy Indicators

• Neonatal jaundice at birth requiring transfusion
• APGAR scores, which measure newborn vital signs such as pulse and respiration at birth, are lower than 4 at one minute and below 6 at five minutes
• Infection or illness during pregnancy, especially cytomegalovirus, rubella, herpes, syphilis or the flu
• Drug or alcohol consumption during pregnancy
• Birth weight below 3.5 pounds
• Admission to Newborn Intensive Care Unit for more than five days
• Craniofacial anomalies
• Use of ototoxic medications given in multiple courses or in combination with loop diuretics, Lasix

Genetic and Environmental Indicators

• Suspicion that your child may not be hearing well
• Visible malformations of the head, neck or the middle and/or inner ear structures
• Family history of permanent or progressive hearing loss in childhood
• Childhood diseases, especially meningitis, scarlet fever and mumps
• Chronic middle ear infections with persistent fluid in the ears for more than three months
• Childhood injuries, including skull fracture, sharp blows to the head or ears, loud noise exposure and damage resulting from items accidentally inserted into the ears.

Related Resources

• Facts About Hearing Loss in Children