HEARING LOSS IN CHILDREN: SIGNS, TYPES, CAUSES & TREATMENT

Hearing Loss in Children: Signs, Types and Causes

Hearing loss is sometimes called an “invisible” disability because you cannot always tell that someone has hearing loss simply by looking at them. Hearing loss may not cause physical pain, but it can affect a child’s communication, language, learning, and social development.

Hearing loss can happen at any age. Some children are born with hearing loss, while others develop it later because of genetic factors, infections, certain medicines, loud noise, or other causes.

Signs of Hearing Loss in Children

Parents and caregivers may be among the first people to notice possible signs of hearing loss.

Some signs in babies and young children include:

• Not reacting to loud sounds.
• Not turning toward sounds as expected.
• Not responding when their name is called.
• Delayed speech or language development.
• Speech that is difficult to understand.
• Frequently asking people to repeat themselves.
• Turning the television or other devices up too loudly.
• Having difficulty understanding speech, especially in noisy places.

If you think your child may have hearing loss, talk to a doctor or audiologist and arrange a hearing screening or hearing test.

Signs of Normal Hearing and Development

Children develop hearing, speech, language, and communication skills at different rates. The following are general examples of developmental behaviors.

From Birth to 3 Months

A baby may:

• React to loud sounds.
• Wake up or startle at loud sounds.
• Become soothed by a familiar voice.
• Begin making sounds such as “goo.”

From 3 to 6 Months

A baby may:

• React to a familiar voice.
• Turn their head or eyes toward sounds.
• Listen to voices.
• Enjoy toys that make sounds.
• Smile when someone talks to them.

From 6 to 12 Months

A baby may:

• Respond to their name.
• Make different babbling sounds.
• Begin understanding familiar words.
• Turn toward familiar sounds.
• React to changes in a person's tone of voice.

Around 12 Months

A child may:

• Copy sounds they hear.
• Recognize their name.
• Understand some familiar words and simple requests.

From 12 to 18 Months

A child may:

• Follow simple directions.
• Point to familiar objects or body parts when asked.
• Use a few simple words.
• Combine sounds and words.

Around 2 Years

A child may:

• Understand simple questions.
• Use familiar words.
• Make simple sentences.
• Follow simple instructions.

Around 3 Years

A child may:

• Use short sentences.
• Tell a simple story.
• Know their name and familiar family members.
• Sing simple songs.

Children do not all reach developmental milestones at exactly the same time. If you have concerns about your child's hearing or development, discuss them with a healthcare professional.

Types of Hearing Loss

There are several types of hearing loss. Hearing loss can be described by where the problem occurs, which ear or ears are affected, or how the hearing changes over time.

Conductive Hearing Loss

Conductive hearing loss occurs when a problem in the outer or middle ear interferes with sound reaching the inner ear.

Possible causes include:

• Ear infections.
• Fluid in the middle ear.
• Earwax blocking the ear canal.
• Problems affecting the ear canal or eardrum.

Conductive hearing loss may make sounds seem quieter. Depending on the cause, treatment may include medicine, removal of an obstruction, or surgery.

Sensorineural Hearing Loss

Sensorineural hearing loss involves the inner ear or the nerve pathways that carry sound information to the brain.

Possible causes include:

• Genetic factors.
• Certain infections.
• Certain medicines.
• Exposure to loud noise.
• Other conditions affecting the inner ear or auditory system.

Sensorineural hearing loss may be permanent. Treatment and hearing technology depend on the individual cause and degree of hearing loss.

Mixed Hearing Loss

Mixed hearing loss includes both conductive and sensorineural hearing loss. This means there may be a problem affecting sound transmission through the outer or middle ear as well as a problem involving the inner ear or auditory system.

Unilateral Hearing Loss

Unilateral hearing loss affects one ear. A child may have normal or better hearing in one ear while having hearing loss in the other ear.

The degree of hearing loss can vary from mild to profound.

Children with unilateral hearing loss may have difficulty:

• Locating where sounds are coming from.
• Understanding speech when there is background noise.
• Hearing classroom instructions.
• Following conversations in noisy environments.

If you notice possible hearing difficulties, an audiologist can perform a hearing evaluation.

How Can You Help a Child With Unilateral Hearing Loss?

Support depends on the child's individual hearing needs. Options may include:

• Hearing aids, when appropriate.
• Assistive listening systems, which can help some children hear speech more clearly.
• Classroom accommodations, such as seating where the child can hear the teacher clearly.
• Reducing unnecessary background noise.
• Making sure teachers know about the child's hearing needs.

Protecting the child's hearing from very loud sounds is also important.

Progressive Hearing Loss

Progressive hearing loss is hearing loss that becomes worse over time. Hearing may change over weeks, months, or years.

Progressive or delayed-onset hearing loss can have different causes, including genetic factors, certain infections, medical conditions, some medicines, and other factors.

Signs That Hearing May Be Changing

Parents may notice that a child:

• Frequently asks people to repeat themselves.
• Turns the television volume up.
• No longer responds to sounds they previously noticed.
• Has increasing difficulty following conversations or instructions.
• Has new problems at school.
• Has balance or dizziness symptoms along with hearing changes.

If you notice a change in your child's hearing, arrange a hearing evaluation. A sudden change in hearing needs prompt medical attention.

Fluctuating Hearing Loss

Fluctuating hearing loss changes over time. A child may hear better at some times and worse at others.

Possible causes can include problems involving the outer or middle ear, certain inner-ear conditions, and other medical conditions. The cause needs to be evaluated by a healthcare professional.

Signs can be difficult to notice, especially in babies and young children. An older child may:

• Have difficulty following directions.
• Become less attentive.
• Have trouble understanding speech.
• Say that sounds seem different.
• Have difficulty hearing with background noise.

If you notice changes in your child's hearing, an audiologist can perform appropriate hearing tests.

Auditory Neuropathy

Auditory neuropathy is a hearing disorder in which the inner ear can detect sound, but the transmission of sound information from the ear to the brain is disrupted.

Children may hear sounds but have difficulty understanding speech clearly, particularly in noisy situations.

The degree of hearing loss can vary. Hearing may remain stable or change over time.

How Is Auditory Neuropathy Diagnosed?

Audiologists may use several tests because different tests examine different parts of the hearing system.

Two important tests are:

• ABR (Auditory Brainstem Response): measures responses along the auditory pathway to sound.
• OAE (Otoacoustic Emissions): measures sounds produced by the inner ear's outer hair cells.

Other tests may include tympanometry, pure-tone testing, and speech testing, depending on the child's age and abilities.

What Causes Auditory Neuropathy?

Auditory neuropathy can have several possible causes. Risk factors in children can include premature birth, problems involving oxygen around birth, jaundice, certain medical conditions, and genetic factors.

How Can You Help a Child With Auditory Neuropathy?

Support depends on the child's hearing and communication needs. Options may include:

• Hearing aids for some children.
• Assistive listening technology.
• Cochlear implants for some children.
• Speech and language support.
• Sign language or other communication approaches.

A pediatric audiologist and other healthcare professionals can help determine which options are appropriate for an individual child.

Hearing Screening and Testing

Hearing screening can identify children who may have hearing loss. It is quick and painless, and babies can often be screened while they are asleep.

The CDC recommends that babies receive hearing screening by 1 month of age. If a baby does not pass the screening, a complete hearing evaluation should be completed as soon as possible, ideally by 3 months of age.

A child who passes a newborn hearing screening can still develop hearing loss later. Parents should therefore pay attention to changes in hearing, speech, language, and communication as the child grows.

If you are concerned about your child's hearing, talk to a doctor or audiologist rather than waiting for the problem to become more noticeable.

FREQUENTLY ASKED QUESTIONS ABOUT HEARING LOSS IN CHILDREN

What Are the Signs of Hearing Loss in Children?

Signs may include not responding to sounds or their name, difficulty understanding speech, delayed speech or language development, frequently asking for repetition, or turning the television volume up. Signs can vary depending on the child's age and type of hearing loss.

What Causes Hearing Loss in Children?

Hearing loss in children can have many causes, including genetic factors, infections, problems affecting the middle or inner ear, certain medications, exposure to loud noise, and certain medical conditions. In some cases, the exact cause may not be identified.

Can a Child Be Born With Hearing Loss?

Yes. Some children are born with hearing loss. It can be associated with genetic factors, certain infections during pregnancy, complications around birth, or other medical factors. Newborn hearing screening can help identify hearing loss early.

Can Hearing Loss Affect Speech Development?

Hearing plays an important role in developing speech and language. When a child has difficulty hearing speech consistently, it may affect their ability to recognize and learn speech sounds and language. Early identification and appropriate support can help address a child's individual communication needs.

What Are the Types of Hearing Loss in Children?

The main types include conductive hearing loss, sensorineural hearing loss, and mixed hearing loss. Hearing loss can also be described as unilateral when it affects one ear or bilateral when it affects both ears.

What Is Unilateral Hearing Loss?

Unilateral hearing loss means that a child has hearing loss in one ear. Children with unilateral hearing loss may have difficulty locating sounds or understanding speech in noisy environments, although the impact varies from child to child.

How Is Hearing Loss Diagnosed in Children?

An audiologist may use different hearing tests depending on the child's age and development. These can include OAE, ABR, tympanometry, pure-tone testing and speech testing. More than one test may be needed to understand a child's hearing accurately.

When Should a Child Have a Hearing Test?

A child should have a hearing evaluation if a parent or caregiver notices concerns about their response to sounds, speech or language development, or ability to understand conversations. Newborn hearing screening is also an important part of early hearing detection.

What Is Auditory Neuropathy?

Auditory neuropathy is a hearing disorder in which the inner ear may detect sound, but the transmission or processing of sound information along the auditory pathway is disrupted. Children may hear sounds but have difficulty understanding speech clearly.

Can Children Develop Hearing Loss After Passing a Newborn Hearing Screening?

Yes. Passing a newborn hearing screening does not guarantee that a child will have normal hearing throughout childhood. Hearing loss can develop later, so parents and caregivers should pay attention to changes in hearing, speech, language and communication as the child grows.

FREQUENTLY ASKED QUESTIONS ABOUT HEARING LOSS IN CHILDREN

What Are the Signs of Hearing Loss in Children?

Signs may include not responding to sounds or their name, difficulty understanding speech, delayed speech or language development, frequently asking for repetition, or turning the television volume up. Signs can vary depending on the child's age and type of hearing loss.

What Causes Hearing Loss in Children?

Hearing loss in children can have many causes, including genetic factors, infections, problems affecting the middle or inner ear, certain medications, exposure to loud noise, and certain medical conditions. In some cases, the exact cause may not be identified.

Can a Child Be Born With Hearing Loss?

Yes. Some children are born with hearing loss. It may be associated with genetic factors, certain infections during pregnancy, complications around birth, or other medical factors. Newborn hearing screening can help identify hearing loss early.

Can Hearing Loss Affect Speech Development?

Yes. Hearing plays an important role in speech and language development. If a child has difficulty hearing speech consistently, it may affect their ability to recognize and learn speech sounds and language. Early identification and appropriate support can help address the child's individual communication needs.

What Are the Types of Hearing Loss in Children?

The main types are conductive hearing loss, sensorineural hearing loss, and mixed hearing loss. Hearing loss can also be described as unilateral when it affects one ear or bilateral when it affects both ears.

What Is Unilateral Hearing Loss?

Unilateral hearing loss means that a child has hearing loss in one ear. It may make it harder to locate sounds or understand speech in noisy environments. The impact can vary from child to child.

How Is Hearing Loss Diagnosed in Children?

An audiologist may use different tests depending on the child's age and development. These may include OAE, ABR, tympanometry, pure-tone testing, and speech testing. More than one test may be needed to understand a child's hearing.

When Should a Child Have a Hearing Test?

A child should have a hearing evaluation if parents or caregivers notice concerns about the child's response to sounds, speech or language development, or ability to understand conversations. Newborn hearing screening is also an important part of early hearing detection.

What Is Auditory Neuropathy?

Auditory neuropathy is a hearing disorder in which the inner ear may detect sound, but the transmission or processing of sound information along the auditory pathway is disrupted. A child may hear sounds but have difficulty understanding speech clearly.

Can Children Develop Hearing Loss After Passing a Newborn Hearing Screening?

Yes. Passing a newborn hearing screening does not guarantee that a child will have normal hearing throughout childhood. Hearing loss can develop later, so parents and caregivers should pay attention to changes in hearing, speech, language, and communication as the child grows.

HOW DOES HEARING WORK? HOW THE EAR WORKS, SOUND & HEARING DEVELOPMENT

                                

                       How Does the Ear Work?

First, here are the parts of the ear:

                  

                                          

Parts of the Ear and How We Hear

Have you ever wondered how does the ear work and how a sound reaches your brain? The ear is a complex organ that helps us hear sounds and maintain our balance.

The human ear has three main parts: the outer ear, middle ear, and inner ear. Together, these parts collect sound waves, turn them into electrical signals, and send information to the brain.

Parts of the Ear

The three main parts of the ear are:

• Outer ear – collects sound and directs it toward the eardrum.

• Middle ear – transfers and amplifies vibrations through three tiny bones.

• Inner ear – converts vibrations into electrical signals and helps with balance.

Understanding these parts of the ear makes it easier to understand how hearing works.

The Outer Ear

The outer ear includes the ear flap, also called the auricle or pinna, and the ear canal.

The ear flap collects sound waves from the surrounding environment and directs them into the ear canal. The ear canal carries the sound waves toward the eardrum, which is also called the tympanic membrane.

When sound waves reach the eardrum, they make it vibrate. These vibrations are then passed to the middle ear.

The Middle Ear

The middle ear contains three tiny bones called the ossicles. They are the:

• Malleus (hammer)

• Incus (anvil)

• Stapes (stirrup)

These three bones connect with the eardrum and help transfer and amplify its vibrations toward the inner ear.

The middle ear also contains the Eustachian tube. It connects the middle ear to the back of the throat and helps balance air pressure on both sides of the eardrum. This is why you may feel your ears “pop” when you swallow, yawn, or travel to a different altitude.

The Inner Ear

The inner ear contains structures that are important for both hearing and balance.

The cochlea is a spiral-shaped structure involved in hearing. It contains fluid and tiny sensory hair cells that respond to movement caused by sound vibrations.

The vestibular system helps maintain balance and sense head movement. It includes three semicircular canals along with other structures that detect the position and movement of the head.

How Does the Ear Work?

So, how does the ear work when we hear a sound?

The process happens in several steps:

1. Sound waves travel through the air and enter the outer ear.

2. The ear flap directs the sound into the ear canal.

3. The sound waves reach the eardrum and make it vibrate.

4. The vibrations move through the three tiny bones in the middle ear.

5. The stapes transfers the vibrations to the inner ear.

6. The vibrations create movement in the fluid inside the cochlea.

7. Tiny hair cells in the cochlea respond to this movement.

8. The hair cells convert the mechanical movement into electrical signals.

9. The signals travel through the auditory nerve toward the brain.

10. The brain processes the signals and allows us to recognize and understand the sound.

This entire process explains how we hear and how sound travels from the environment to the brain.

How Does Sound Travel to the Brain?

Sound does not travel directly from the ear to the brain as ordinary sound waves. Instead, the ear changes sound vibrations into electrical signals.

The pathway can be summarized as:

Sound waves → ear canal → eardrum → ossicles → cochlea → hair cells → auditory nerve → brain

The auditory nerve carries information from the inner ear toward the brain. The brain then processes these signals so we can identify and understand different sounds.

For example, when you hear a car horn, your ear detects the sound and sends information through the auditory pathway. Your brain processes that information and recognizes it as a car horn.

Why Is the Ear Important?

The ear is important not only for hearing but also for maintaining balance.

The cochlea plays a major role in hearing, while the vestibular system helps the brain understand head movement and body position. This is why the ear is closely connected with both our ability to hear and our sense of balance.

Understanding ear anatomy, including the outer ear, middle ear, inner ear, cochlea, eardrum, ossicles, and auditory nerve, helps explain the remarkable process of hearing.

In simple terms, how the ear works can be understood as a chain of events: the outer ear collects sound, the middle ear transfers vibrations, the inner ear converts those vibrations into electrical signals, and the brain interprets the signals as the sounds we hear. 

How Our Hearing Changes as We Grow?

Have you ever wondered how hearing changes as we grow? Our ability to hear develops during childhood and continues to change throughout life. A child's hearing develops rapidly during the early years, especially from birth through the preschool years.

Children can actually hear sounds before they are born. After birth, they continue to develop the ability to detect, recognize, and understand different sounds.

Hearing Development in Children

Here are some general stages of child hearing development:

At Birth

A newborn baby can usually:

• Respond to loud sounds.

• Startle or move in response to sudden noises.

• Recognize and respond to familiar voices, including a parent's voice.

Around 3 to 6 Months

As a baby's hearing develops, they may:

• Respond to softer sounds.

• Turn toward sounds or voices.

• Begin to recognize familiar voices.

• Notice differences between sounds.

Hearing development continues as children grow. By listening to speech and other sounds around them, children gradually learn to recognize words, voices, and different types of sounds.

The Sounds We Hear

Sound is produced by vibrations. These vibrations travel through a medium such as air as sound waves.

Sound waves have different properties, including frequency and amplitude. These properties affect how we perceive sounds.

What Is Frequency?

Frequency describes how many times a sound wave vibrates in one second. It is measured in hertz (Hz).

Frequency is related to the pitch of a sound:

• High-frequency sounds have a higher pitch, such as a whistle or squeal.

• Low-frequency sounds have a lower pitch, such as thunder or a deep voice.

It is important to remember that frequency is not the speed of sound. The speed of sound describes how quickly a sound wave travels through a particular medium, while frequency describes the rate at which the wave vibrates.

What Is Loudness?

The size or amplitude of a sound wave is related to how loud the sound can be perceived.

Sound level is commonly measured in decibels (dB). A higher sound level generally means a louder sound, while a lower sound level means a quieter sound.

For example, a quiet conversation and a loud concert produce very different sound levels.

Why Understanding Hearing Development Matters

Understanding hearing development in children can help parents and caregivers notice how children respond to voices and sounds as they grow.

Hearing plays an important role in developing communication and language skills. If a child does not respond to sounds or voices as expected, parents and caregivers can discuss their concerns with a healthcare professional or hearing specialist.

As we grow, our hearing can also change because of factors such as age, repeated exposure to loud sounds, and other conditions. Protecting our ears from excessively loud noise is an important part of maintaining healthy hearing.

The Sounds We Hear

Sound is all around us. We hear voices, music, traffic, birds, alarms, and many other sounds every day. But what exactly is sound, and how do we describe the sounds we hear?

Understanding sound waves, frequency, pitch, and loudness can help us understand how hearing works.

Facts About Sound

Sound is produced when something vibrates. These vibrations travel through a medium, such as air, as sound waves.

Sound waves have different properties that affect how we hear them.

What Is Frequency?

Frequency describes how many times a sound wave vibrates per second. It is measured in hertz (Hz).

Frequency is related to the pitch of a sound:

• High-frequency sounds have a higher pitch, such as a squeal or whistle.

• Low-frequency sounds have a lower pitch, such as thunder or a deep voice.

Frequency is not the speed of sound. The speed of sound describes how quickly a sound wave travels through a particular material, while frequency describes how often the wave vibrates.

What Is Loudness?

The amplitude of a sound wave is related to the sound's intensity, which affects how loud it is perceived.

Sound level is commonly measured in decibels (dB). The higher the sound level, the louder the sound generally seems.

How Loud Are Everyday Sounds?

The loudness of everyday sounds can vary depending on distance and other conditions. Approximate sound levels include:

Sound	Approximate sound level
Whisper	About 20–30 dB
Refrigerator humming	About 40 dB
Normal conversation	About 60 dB
City traffic	About 80 dB
Lawn mower	About 90 dB
Chainsaw	About 110 dB
Firecracker	Can reach very high sound levels, around 140 dB or more at close range

These values are approximate rather than fixed. For example, a lawn mower may produce different sound levels depending on the model, distance, and surroundings.

What Sounds Can People With Normal Hearing Hear?

The commonly cited range of human hearing is approximately 20 Hz to 20,000 Hz (20 kHz), although the exact range varies between individuals and generally becomes narrower with age.

Hearing sensitivity also varies across frequencies. Being able to detect a sound at a particular frequency does not mean that every person hears that frequency equally well.

Here are examples of different sound frequencies:

Sound	Approximate frequency range
Thunder	Often contains very low-frequency sounds
Human speech	Mainly falls within the range of several hundred to several thousand hertz
High musical notes	Can contain frequencies of several thousand hertz or more

The exact frequency of a sound depends on the source. Human speech, for example, contains a wide range of frequencies rather than one single frequency.

What Can Children With Hearing Loss Hear?

Hearing loss in children can vary greatly from one child to another. Some children may have difficulty hearing certain frequencies or may have different degrees of hearing loss.

The type and degree of hearing loss can affect how clearly a child hears speech and other sounds.

For example, some children may hear lower-frequency sounds better than higher-frequency sounds. When high-frequency hearing is reduced, certain speech sounds may be more difficult to hear clearly.

Some consonants, such as “s” and “f,” contain important high-frequency sound information. Vowel sounds generally contain stronger low-frequency information.

Because speech contains a mixture of different frequencies, reduced hearing at certain frequencies can make it harder for a child to distinguish some speech sounds.

Hearing tests can show which frequencies a child can hear and how well they can hear sounds at different levels. A hearing professional can use these results to understand the child's individual hearing needs.

Why Are Sound Frequency and Loudness Important?

Understanding sound frequency and loudness helps us understand both normal hearing and hearing loss.

Frequency helps describe whether a sound is high or low in pitch, while decibels describe sound level. Both are important when measuring hearing and evaluating how well someone can hear different sounds.