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PAEDIATRIC CANCER SURVIVORSHIP — LATE EFFECTS
Hearing loss after childhood cancer treatment — what parents need to know
If your child received platinum-based chemotherapy, they may be at risk of ototoxicity — hearing damage caused by treatment. Understanding this late effect early gives you the best chance to protect your child's speech, learning, and quality of life.
- Regular audiometry — hearing tests before, during, and after platinum chemotherapy
- Early detection matters — the sooner hearing loss is found, the sooner support can start
- Multidisciplinary support — oncology, audiology, and speech therapy coordinated together
- Long-term follow-up — survivorship plans that continue well beyond the end of treatment
Medically reviewed by the CION Paediatric Oncology Team · Last reviewed June 2026
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SURVIVORSHIP · LATE EFFECT
What is hearing loss after childhood cancer treatment?
When a child is diagnosed with cancer, treatment is chosen because the benefits far outweigh the risks. But some medicines and radiotherapy can leave effects that last long after treatment ends. Hearing loss — medically called ototoxicity when caused by a drug — is one of the more common late effects in survivors who received certain chemotherapy regimens.
The hearing organ, called the cochlea, contains thousands of tiny hair cells that translate sound vibrations into signals the brain can understand. Platinum-based chemotherapy medicines can damage or destroy these cells — particularly those responsible for high-frequency sounds. Because cochlear hair cells do not regenerate once lost, this type of hearing loss is usually permanent.
The critical word for parents is "early". Hearing loss that is caught while it is still mild can be managed before it affects your child's speech, reading, and confidence in school. Hearing loss that goes unnoticed for years can be much harder to address.
This page explains what causes hearing loss after childhood cancer, the signs to watch for, how it is tested, and what support is available — so you can ask the right questions at your next follow-up appointment.
Did you know?
Hearing loss is one of the most common late effects in children treated with platinum-based chemotherapy — which is used in protocols for neuroblastoma, medulloblastoma, hepatoblastoma, osteosarcoma, and some germ-cell tumours. Children are more vulnerable than adults because their hearing systems are still maturing, and because they often receive higher weight-adjusted doses. International paediatric oncology guidelines recommend baseline audiometry before platinum treatment starts and serial monitoring throughout and after therapy. (Source: Children's Oncology Group Long-Term Follow-Up Guidelines, COG LTFU v5.0)
RISK FACTORS FOR OTOTOXICITY
Which children are most at risk of ototoxicity?
Not every child who receives platinum chemotherapy will develop noticeable hearing loss — but several factors increase the risk. Knowing your child's risk profile helps you and the team decide how closely to monitor.
Highest risk
Younger age at treatment
Infants and toddlers are more vulnerable to platinum hearing loss than older children or teenagers. The hearing system is still developing in the early years, making it more susceptible to drug damage at lower cumulative doses.
Dose-related
High cumulative dose of platinum
The total amount of platinum medicine received across all chemotherapy cycles matters more than any single dose. Protocols that use multiple courses of platinum carry a higher ototoxicity burden than those that use it briefly.
Combined effect
Cranial or skull-base radiation
Radiotherapy directed at the brain, posterior fossa, or skull base can independently damage the cochlea and the auditory nerve. When combined with platinum chemotherapy, the two effects compound each other, increasing the likelihood and severity of loss.
Cancer type
Tumour type and treatment protocol
Children treated for neuroblastoma, medulloblastoma, hepatoblastoma, osteosarcoma, and germ-cell tumours are most commonly exposed to high-dose platinum regimens. The specific protocol used — and whether carboplatin or cisplatin is given — also influences risk. Cisplatin generally carries higher ototoxic risk than carboplatin at standard doses.
Pre-existing
Existing hearing difficulty before treatment
A child who already has mild hearing loss — from recurrent ear infections, a congenital condition, or another cause — starts at a lower baseline and may reach the threshold for functional impairment more quickly than a child who starts with normal hearing.
Genetic
Genetic factors
Some children carry genetic variants that affect how their body processes platinum medicines, making their cochlear cells more sensitive to damage at the same dose. Research in this area is ongoing, but genetic testing is beginning to inform survivorship planning in some specialist centres.
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MONITORING AND DETECTION
How hearing loss after childhood chemotherapy is detected
The foundation of ototoxicity management is structured, repeated hearing testing. The steps below reflect the approach recommended by paediatric oncology groups internationally, adapted to your child's individual circumstances.
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Baseline audiogram before platinum treatment
If time allows before chemotherapy begins, a full hearing assessment (pure-tone audiometry, or ABR testing in very young children) documents your child's starting point. This baseline makes it possible to measure any change precisely during and after treatment.
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Monitoring during chemotherapy cycles
Repeat hearing tests — typically every three to six months during treatment — allow the team to detect early changes. If significant hearing loss is identified during treatment, the care team can discuss adjustments to the plan. This is a shared medical decision that weighs the risk of hearing damage against the need to treat the cancer effectively.
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Assessment at the end of treatment
A comprehensive audiological evaluation at the completion of platinum chemotherapy gives the clearest picture of the overall impact. At this point, the degree and pattern of any loss are documented and a plan for ongoing monitoring is made.
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Annual follow-up in survivorship
Hearing can continue to deteriorate after chemotherapy ends — sometimes for years — particularly if the child also received cranial radiation. Annual audiometry is recommended for at least five years after the completion of platinum treatment. Children who entered noisy school environments may notice difficulties at this stage that weren't apparent in a quiet clinic room.
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School and speech assessment
For younger children, a referral to a speech-language therapist helps identify any impact on speech development, vocabulary, or reading. A school assessment can trigger accommodations — such as preferential seating or a classroom FM sound system — that help the child learn without being held back by hearing difficulties.
SIGNS TO WATCH FOR
Signs of hearing loss to watch for at home
Hearing tests are essential — but parents often notice something is wrong before the next clinic appointment. You know your child better than anyone. If any of the following ring true, mention it at your child's next visit and ask specifically for a hearing review.
- Your child frequently asks you to repeat what you said, even in a quiet room
- The TV or music volume is noticeably louder than before treatment
- Your child struggles to follow conversations when there is background noise (a busy restaurant, the school canteen)
- They appear inattentive in class, or teachers have said they seem to be "in their own world" — a common sign that a child is missing high-frequency speech sounds
- A child who spoke clearly before treatment has regressed or is harder to understand
- Your child complains of ringing or buzzing in the ears (tinnitus)
- Babies and toddlers: not startling to unexpected sounds, not turning towards voices, or slower than expected speech milestones after treatment
Early-stage hearing loss tends to affect high-frequency sounds first — letters like 's', 'f', 'th', and 'sh'. At this stage, speech can still sound mostly normal, and the loss is easy to miss in everyday conversation. A formal audiogram is the only way to detect and measure it accurately.
This page is for information only. If you are concerned about your child's hearing, please speak to your child's oncologist or paediatrician — do not use this content as a substitute for professional medical evaluation.
Did you know?
Hearing loss can silently affect a child's school performance before it is formally identified. Children with undiagnosed high-frequency hearing loss are sometimes labelled "inattentive" or "slow to learn" when in reality they are missing key sounds in the classroom. Early audiological intervention — hearing aids, FM systems, or preferential seating — has been shown to significantly improve educational outcomes in childhood cancer survivors. This is why survivorship follow-up matters: catching late effects early protects your child's future, not just their health. (Source: Children's Oncology Group Long-Term Follow-Up Guidelines, COG LTFU v5.0)
MANAGEMENT AND SUPPORT
What can be done to help a child with hearing loss after cancer?
The right support depends on the degree of loss and your child's age and situation. Most children do very well with the right combination of technology, therapy, and school accommodations.
Hearing aids
For moderate-to-severe hearing loss, modern hearing aids are small, discreet, and highly effective. Today's digital devices can be tuned precisely to a child's pattern of loss and adjusted as the child grows. Many families are surprised by how well children adapt to wearing them.
Classroom FM systems
A sound-field FM system wirelessly transmits the teacher's voice directly to a receiver worn by the child or to speakers in the classroom. This cuts through background noise and is particularly useful for children with mild loss who do not yet need hearing aids.
Speech and language therapy
Children who experienced hearing loss during the years when speech and language were developing may need targeted therapy to catch up. A speech-language therapist works on articulation, vocabulary, phonological awareness, and listening skills — building foundations that support reading and academic progress.
School accommodations
Children with documented hearing loss are entitled to reasonable adjustments at school. These typically include preferential seating near the teacher, written instructions alongside verbal ones, extra time in exams, and access to assistive listening devices. Your child's audiologist can provide a letter supporting these requests.
Cochlear implants (selected cases)
Children with severe-to-profound hearing loss in both ears, who do not benefit adequately from hearing aids, may be referred for cochlear implant evaluation. This is a significant surgical decision that requires detailed specialist assessment and is not appropriate for every child — your team will guide you honestly on whether it is worth exploring.
Protecting remaining hearing
Children who have already experienced some hearing loss need to protect what they have. This means avoiding excessively loud music through headphones, wearing hearing protection at loud events, and treating ear infections promptly. Small daily habits can slow progression and preserve the range of hearing that remains.
At CION Cancer Clinics, survivorship follow-up includes coordinating the referrals your child needs — audiology, speech therapy, school liaison — through our multidisciplinary team. You should not have to navigate this alone. Learn more about our paediatric cancer care or explore our guidance on childhood cancer survival rates.
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Common questions
Questions parents ask about hearing loss after childhood cancer
Why does chemotherapy cause hearing loss in children?
Certain chemotherapy medicines — particularly those in the platinum group — can damage the delicate hair cells inside the cochlea (the hearing organ in the inner ear). These hair cells convert sound waves into electrical signals that the brain interprets as sound. Once damaged, they do not regenerate. The higher the cumulative dose of the medicine and the younger the child, the greater the risk. Radiation to the brain or skull can also damage the hearing pathway, and the two effects can combine when both treatments are used.
How do I know if my child's hearing has been affected by treatment?
The earliest losses are usually in the high-frequency range — sounds like 's', 'f', and 'th' become harder to distinguish. Your child might ask you to repeat yourself often, turn up the TV louder than before, or seem inattentive in class. Formal hearing testing (audiometry) is the only reliable way to detect and measure the loss. A baseline hearing test before treatment starts, and repeat tests every three to six months during treatment and annually afterwards, is the recommended approach in most paediatric oncology guidelines.
What is ototoxicity, and which children are most at risk?
Ototoxicity means damage to the ear caused by a medication. Children treated with platinum-based chemotherapy — used in protocols for neuroblastoma, hepatoblastoma, medulloblastoma, osteosarcoma, and some germ-cell tumours — are most commonly at risk. Younger age at treatment, higher cumulative drug dose, prior or concurrent radiation to the head or skull base, and pre-existing hearing difficulties all increase risk. Children who received cranial radiation are also at risk of central auditory processing difficulties, which is a related but distinct problem.
Is hearing loss after childhood cancer treatment permanent?
Sensorineural hearing loss caused by platinum-based chemotherapy or radiation is generally permanent, because it results from the death of cochlear hair cells that cannot regrow. However, the degree of loss varies — some children have only mild high-frequency loss with minimal day-to-day impact, while others have moderate-to-severe loss that requires hearing aids or other support. It is important not to assume the worst without formal testing: not every child who received platinum chemotherapy will develop clinically significant hearing loss.
What can be done to help a child with hearing loss after cancer treatment?
Management depends on the degree of loss. Mild high-frequency loss may need only classroom accommodations — preferential seating, a sound-field FM system, and alerting teachers. Moderate-to-severe loss is usually addressed with hearing aids, which today are small, discreet, and effective. Children with severe or profound loss in both ears may be candidates for cochlear implants, though this is assessed case by case. Speech and language therapy helps children who have fallen behind in speech development. Early detection through regular audiometry is the most important step, because the sooner a hearing loss is identified, the sooner support can start.
When should I ask the treating team for a hearing test?
Ask for a baseline audiogram before platinum chemotherapy begins if at all possible. During treatment, repeat testing is typically recommended every three to six months. After treatment ends, annual hearing tests should continue for at least five years — and ideally into adulthood — because some losses evolve or become more noticeable as children enter noisier school environments. If your child's care plan does not include hearing monitoring, you have every right to ask for it to be added. At CION, survivorship follow-up includes coordinating these referrals through our multidisciplinary team.
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