Hearing Loss: Causes, Testing, Treatment & Prevention

Hearing loss may start at once or develop over time. It can affect one or both ears. It can range from mild to profound ^1,3.

The World Health Organization defines normal hearing as thresholds of 20 decibels or better in both ears ¹. More than 430 million people worldwide need care for disabling hearing loss ². This figure may rise above 700 million by 2050 ².

Understanding hearing loss causes, testing, treatment and prevention can help people seek care sooner. Early care may reduce the effects on communication and daily life ^1,2.

This guide explains hearing loss symptoms, causes, hearing tests, treatment, and prevention. It also covers warning signs that need fast medical care.

Hearing uses several parts of the ear. Sound passes through the outer and middle ear before reaching the inner ear. The hearing nerve then carries signals toward the brain ^5,9.

A problem in any part of this pathway may reduce hearing ^5,9.

Clinicians divide hearing loss into three main types:

Hearing loss may be mild, moderate, moderately severe, severe, or profound ^1,2. Its degree describes how loud sounds must be before someone can hear them ⁷.

Conductive hearing loss may improve after treatment of a blockage or middle ear problem ⁵. Most hearing loss in adults is permanent or slowly gets worse. However, hearing devices and other support may improve communication ^1,3.

Early identification matters because hearing loss can affect daily roles and personal contact ^1,2. Rehabilitation may help people take part in work, school, family life, and community activities ².

Hearing loss symptoms may be hard to notice at first. Family members may see changes before the person with hearing loss does ^8,9.

Common signs of hearing loss include:

Trouble hearing speech can affect social contact and close relationships ⁹. Hearing loss is also linked with social isolation and lower quality of life ^5,9. It is associated with depression, falls, and other health concerns ^5,9.

Hearing loss can begin before birth, during birth, or later in childhood ². Early identification can limit its effects on communication and language development ^1,2.

Any concern about a child’s hearing or communication should lead to an assessment. Screening newborns and children can help find hearing problems early ².

Children with hearing loss may need different types of support. Options include hearing devices, speech therapy, special education, and sign language teaching ^1,2. The care plan should match the child’s hearing and communication needs.

Arrange an assessment for hearing problems that continue. Examples include trouble following speech or repeated requests for clarification ^8,9. A lasting need to raise device volume also supports getting a hearing test ^8,9.

Specialist review may be needed for certain symptoms. These include unexplained hearing loss in one ear or hearing that changes over time. Lasting one-sided tinnitus or repeated vertigo also needs medical review.

Some hearing changes need immediate assessment:

Hearing that gets worse over 4 to 90 days needs an urgent specialist referral. The recommended assessment time is within two weeks.

Lasting ear discharge also needs medical review. The same applies to ongoing ear pain or an unusual-looking eardrum.

Hearing loss may be congenital or acquired. Congenital means it is present at birth. Acquired hearing loss begins later in life.

Conductive hearing loss blocks the movement of sound through the outer or middle ear ^5,7.

Possible conductive hearing loss causes include:

Treatment varies by cause. Wax, fluid, or infection may contribute to hearing loss; treating some causes may improve hearing ^5,7,8. Surgery may help when the eardrum, middle ear bones, or ear structure is involved ^5,7.

Sensorineural hearing loss affects the inner ear or hearing nerve ⁵. Causes include aging, loud noise, genes, illness, infection, and head injury ^2,3,7.

Age-related sensorineural loss is the most common form in adults ⁹. Genes, aging, noise, tobacco, and harmful medicines may play a role ⁹.

Long-term exposure to loud noise may cause lasting hearing changes. A powerful blast may harm the eardrum or cochlea. The cochlea is the curled part of the inner ear that helps process sound.

Chronic disease and smoking are also linked with hearing loss ². Other risks include viral infections and trauma to the head or ear ². Some workplace chemicals may harm hearing as well ².

Mixed hearing loss combines an outer or middle ear problem with inner ear damage ⁷. For example, separate problems may affect more than one part of the ear ⁷.

Both inherited and non-inherited gene changes may cause hearing loss ². Some genetic forms begin early in life. Others start or worsen later ^2,3.

Risks before or near birth include:

Childhood causes include meningitis and long-term ear infections ². Ongoing middle ear fluid may also affect hearing ². Nearly 60% of childhood hearing loss is linked to avoidable causes ². Public health steps may prevent these causes ².

Some antibiotics may harm the inner ear. Certain drugs for malaria and cancer chemotherapy may also damage hearing. These medicines are called ototoxic medicines.

Workplace chemicals may also be ototoxic ². People should not stop prescribed treatment without speaking with their care team. Those receiving ototoxic drugs are among the groups advised to have hearing checks ².

Hearing tests help show whether hearing loss is present. They also measure its type and degree ⁵. Testing often starts with questions and an ear exam.

A clinician may ask when the change began. The clinician may also test hearing in one or both ears ^8,9.

Other questions may cover whether hearing changes or gets worse. The history may include infections, injuries, ear surgery, and noise exposure ^8,9.

The clinician may ask about hearing loss in the family ⁹. Other key details include diabetes, stroke, and medicine use ⁹.

Next, the clinician looks inside the ear. This exam may find wax, infection, eardrum changes, or structural problems ^5,8,9.

An exam may assess hearing loss in each ear; some hearing loss involves the auditory nerve ⁹. Lab tests are not generally needed unless a body-wide illness is suspected ⁹.

A primary care clinician may begin with a whisper test ^5,8. The clinician tests each ear with softly spoken words ^5,8.

A full hearing assessment may use these tests:

Tympanometry may help find wax, middle ear fluid, or an eardrum hole ⁵. It may also show poor movement of the middle ear bones ⁵.

An audiologist is a trained hearing care professional. This specialist tests hearing and diagnoses hearing loss ⁵. An audiologist also provides hearing devices and support services ⁵.

An ear, nose, and throat doctor is often called an ENT. This doctor assesses ear disease and possible medical or surgical causes ⁵.

An audiogram is a chart made during formal hearing tests. It shows the softest sounds heard at low and high pitches ^7,10.

The results show the degree of hearing loss and which ear is more affected ⁵. They also help classify the loss as conductive, sensorineural, or mixed ⁵.

A comparison of air and bone testing can locate the affected part of the hearing pathway ^5,7. The test pattern can also show which pitches are harder to hear ^7,10.

A clinician may consider CT or MRI scans for sudden or uneven hearing loss ⁹. Imaging may also be used after trauma or suspected damage to middle ear bones ^7,9. A scan may be ordered when a tumor is a concern ⁷.

Hearing loss treatment depends on its cause and type ^5,8. The degree of loss and its effect on communication also guide care ¹⁰.

Treatment may correct a cause that can be changed. It may also improve access to sound or teach new communication skills.

Professional removal of blocked wax may restore hearing ^8,9. A clinician may use suction or a small tool. Electronic irrigation is another option in some cases.

Middle ear treatment may involve care for infection or fluid ^5,7,8. Small ear tubes may help drain fluid from repeated infections.

Surgery may repair a perforated eardrum ^5,7. It may also treat problems with middle ear bones or ear structure ^5,7.

Do not place cotton swabs or small objects in the ear canal. They can damage the canal or eardrum. They may also push wax farther into the ear.

Hearing aids sit in or behind the ear. They make sounds louder ^5,8.

An audiologist can explain the available hearing aid types. The audiologist can also fit and adjust the device.

A cochlear implant does not simply make sound louder. It bypasses damaged inner ear parts and stimulates the hearing nerve ^8,10.

A cochlear implant may help when a regular hearing aid provides too little benefit. An audiologist and ENT can discuss the risks and benefits.

Bone-conduction implants send sound vibrations through bone to the inner ear ¹⁰. Bone-conduction and middle ear implants are other tools used in hearing care ².

Many forms of adult hearing loss are permanent or slowly progressive. Still, hearing technology and training may support a more active daily life ².

Rehabilitation may improve access to work, school, family roles, and community life ².

Available support may include:

Simple changes may make a talk easier to follow. Face the speaker and reduce background noise when possible. Choose a quiet place and ask people to speak clearly.

Realistic goals are important. Hearing aids and implants do not work the same way for every person. Follow-up care can help adjust a device to a person’s needs ^8,10.

The World Health Organization estimates that about half of hearing loss may be prevented through public health action ¹. Hearing loss prevention includes safe listening and infection control. It also includes ear care, screening, and careful medicine use.

Noise risk depends on loudness, exposure time, and how often exposure occurs.

These steps can help reduce loud-noise exposure:

NIOSH recommends a workplace limit of 85 dBA over an eight-hour day. For each rise of 3 dBA, NIOSH advises cutting the exposure time in half.

Noise at 85 dBA often makes people raise their voice. This applies when speaking to someone three feet away.

Ringing after noise exposure may be a warning sign. Sounds may also seem dull or flat after leaving a loud place.

Workplaces can reduce noise at its source. They may remove loud equipment or replace it with quieter tools. Barriers and quiet break areas can also reduce exposure.

Vaccines can prevent some infections linked with hearing loss ^1,3. These infections include measles, mumps, meningitis, and rubella ^1,3.

Rubella vaccination before pregnancy may lower the risk of congenital hearing loss ¹. Steps that prevent cytomegalovirus during pregnancy may also reduce this risk ¹.

Good care during pregnancy and childhood supports hearing loss prevention ². Genetic counseling may also form part of prevention efforts ².

Finding and treating common ear conditions is another key step ². Care for long-term ear infections and middle ear fluid addresses conditions linked to childhood hearing loss ².

Workplace hearing screening should include people exposed to noise or chemicals ². Careful drug use may help prevent some ototoxic hearing loss ².

When ototoxic medicines are used, identifying hearing loss early is important ². Medicine decisions should be made with the prescribing care team.

Risk-based hearing checks can find hearing loss and ear disease sooner ².

Groups advised to receive systematic screening include:

A screening test is not the same as a full hearing exam. A concerning result may lead to detailed testing by an audiologist ⁵.

Ongoing hearing trouble also deserves a professional assessment ⁵. Hearing tests can show the degree and type of hearing loss ⁵.

Healthy ear care means keeping objects out of the ear canal. Cotton swabs may push wax deeper into the ear. Small objects may also harm the ear canal or eardrum.

Understanding hearing loss causes, testing, treatment and prevention can support earlier care. Early identification may reduce effects on communication and daily activities ^1,2.

Arrange a professional test for hearing problems that continue. If hearing loss begins within three days, seek immediate ENT or emergency department care.

Many adult sensorineural losses are permanent or slowly get worse. Hearing aids, implants, and rehabilitation can still improve communication and participation ^1,2,3.

Safe listening is a central part of hearing loss prevention ^1,2,4. Vaccines, workplace controls, hearing checks, and good ear care also reduce avoidable risks ^1,2,4.