Common Causes of Hearing Loss

Many illnesses and infections can affect hearing, either temporarily or permanently. Hearing loss can be caused by a variety of factors, including:

Aging (Presbycusis)

Age-related hearing loss happens gradually as people get older, mainly due to natural changes in the inner ear (especially the cochlea) or the auditory nerve.

Type: Sensorineural hearing loss, caused by damage to the inner ear hair cells or auditory nerve pathways.

Symptoms:

Difficulty hearing high-pitched sounds (e.g., birds chirping, children’s voices)
Trouble understanding speech in noisy environments
Needing to turn up the TV or radio volume
Sounds seeming muffled or unclear

Management:

Hearing aids or assistive listening devices
Cochlear implants in advanced cases
Regular audiological check-ups for monitoring and adjustment

Loud Noise Exposure (Occupational or Recreational)

Prolonged or repeated exposure to loud sounds can cause permanent damage to the hair cells in the inner ear (cochlea), leading to noise-induced hearing loss (NIHL).

Sound levels (measured in decibels – dB):

Safe: Below 70 dB (normal conversation ≈ 60 dB)
Risk starts: Around 85 dB (heavy traffic, loud music)
Dangerous: Above 100 dB (concerts, power tools)

Key fact: Every 3 dB increase halves the safe exposure time (e.g., 8 hours at 85 dB ≈ 4 hours at 88 dB).

Effects on hearing:

Gradual hearing loss (high frequencies affected first)
Ringing in the ears (tinnitus)
Difficulty hearing speech, especially in noisy places

Protection and prevention:

Wear earplugs or earmuffs in noisy settings
Keep headphone volumes below 60% of max and limit use
Take quiet breaks to rest your ears
Regular hearing tests for those in noisy environments

Ear Infections or Fluid Buildup

Ear infections and middle ear fluid (also known as otitis media with effusion) are common causes of temporary hearing loss — especially in children. When the middle ear fills with fluid, sound cannot travel efficiently through the ear, resulting in muffled or reduced hearing.

This fluid often develops after a cold, sinus infection, or allergies, and may persist even after pain or fever subsides. Chronic or repeated infections can affect speech and language development if left untreated.

Early assessment by an audiologist or ENT specialist helps identify the cause and guide the right treatment, ensuring hearing returns to normal.

Earwax Blockage

Earwax is a natural substance made by glands in the ear canal. It protects the ear by trapping dust, debris, and bacteria, and also moisturises the ear canal. Normally, it works its way out of the ear naturally.

When too much wax builds up, it can block the ear canal — called impacted earwax. This stops sound waves from reaching the eardrum properly and causes conductive hearing loss.

Common symptoms of earwax buildup:

Muffled or reduced hearing (like having a “plugged” ear)
Feeling of fullness or pressure in the ear
Itching or mild pain
Ringing in the ear (tinnitus)
Sometimes dizziness or coughing

Safe treatment options:

Ear drops (e.g., olive oil, glycerin, or cerumenolytic drops) to soften wax
Professional ear cleaning by a doctor or audiologist (using irrigation, suction, or manual tools)

Avoid:

Cotton buds/Q-tips — they push wax deeper and can cause injury or infection
Sharp objects or ear candles — unsafe and ineffective

Head or Ear Trauma

Trauma to the head or ears can affect hearing depending on which part of the ear or auditory system is injured.

Outer or Middle Ear Trauma (Conductive Hearing Loss)

Common causes include eardrum rupture (from a blow, loud explosion, or inserting objects), fracture or dislocation of the tiny middle ear bones (ossicles), and bleeding or swelling in the ear canal. This type of hearing loss is often temporary, but severe trauma can cause lasting damage.

Inner Ear or Nerve Trauma (Sensorineural Hearing Loss)

Injuries that damage the cochlea or auditory nerve — such as severe head injuries, skull fractures, acoustic trauma from extremely loud noise, or whiplash — can cause permanent hearing loss, tinnitus, and balance problems.

Central Auditory Pathway Trauma

Sometimes the brain’s hearing centres are affected even if the ears are fine. This can cause difficulty understanding speech, distorted hearing, or “normal” hearing test results despite real hearing problems.

Treatment and management:

Medical evaluation (ENT or audiologist) — essential after any head or ear injury
Hearing tests (audiometry) to assess damage
Surgical repair for eardrum or ossicular chain damage
Steroids (in some inner ear injuries) to reduce inflammation
Hearing aids or implants for permanent hearing loss

Ototoxic Medications

Ototoxicity means “ear poisoning.” It occurs when certain medications or chemicals damage the inner ear — specifically the cochlea (hearing organ) or vestibular system (balance organ). This can lead to hearing loss (temporary or permanent), tinnitus, and balance problems or dizziness.

Main groups of ototoxic medications:

Aminoglycoside antibiotics (e.g., Gentamicin, Amikacin) — used for severe bacterial infections; can cause permanent sensorineural hearing loss
Chemotherapy drugs (e.g., Cisplatin, Carboplatin) — can damage inner ear hair cells, leading to high-frequency hearing loss
Loop diuretics (e.g., Furosemide/Lasix) — usually causes temporary hearing loss
Salicylates (e.g., Aspirin in high doses) — can cause temporary tinnitus and mild hearing loss
Antimalarial drugs (e.g., Quinine, Chloroquine) — high doses can cause temporary or sometimes permanent hearing loss

Prevention and monitoring:

Use ototoxic medications only when medically necessary
Regular hearing tests (audiometry) during treatment
Report symptoms early — hearing loss can sometimes be stopped or reversed if the drug is discontinued in time

Genetic Conditions

Genetic (hereditary) hearing loss happens when there are changes (mutations) in a person’s DNA that affect how the ear develops or functions. It can be present at birth (congenital) or develop later in life (progressive).

Non-syndromic hearing loss (70–80% of genetic cases): The hearing loss occurs on its own with no other health problems. The most common cause worldwide is the GJB2/Connexin 26 gene mutation.

Syndromic hearing loss (20–30% of genetic cases): Hearing loss occurs alongside other symptoms or medical conditions.

Diagnosis and management:

Newborn hearing screening
Genetic testing to identify the specific mutation
Audiological monitoring to track progression
Hearing aids, cochlear implants, or speech therapy depending on severity
Genetic counselling for families

Illnesses Such as Meningitis or Meniere’s Disease

Many illnesses and infections can affect hearing, either temporarily or permanently, depending on which part of the ear or nervous system they damage.

Ear infections (Otitis Media): Common in children. Fluid or pus builds up behind the eardrum, causing conductive hearing loss. Usually temporary, but chronic infections can cause permanent damage.
Meningitis: A serious infection that can spread to the inner ear or auditory nerve, causing sudden and often permanent sensorineural hearing loss. One of the most common causes of acquired deafness in children.
Measles: Can damage inner ear hair cells, causing sensorineural hearing loss. Preventable through the MMR vaccine.
Mumps: Can cause sudden, usually one-sided hearing loss that is often permanent.
Rubella (German Measles): If contracted during pregnancy, can cause congenital hearing loss in the baby. Preventable by vaccination.
Cytomegalovirus (CMV): If transmitted during pregnancy, can cause congenital hearing loss that may appear at birth or develop gradually.
Autoimmune Inner Ear Disease (AIED): The body’s immune system attacks the inner ear, leading to progressive sensorineural hearing loss in both ears.
Diabetes: Poor blood circulation can affect the tiny blood vessels of the inner ear, increasing the risk of sensorineural hearing loss over time.
Viral or Bacterial Labyrinthitis: Infection of the inner ear causing hearing loss, tinnitus, and vertigo.