Allergic Rhinitis and Hearing Loss in Youth

Children and adolescents with allergic rhinitis (AR) show measurable signs of hearing damage that standard tests often miss. A new study of 90 participants found significant differences in a range of sensitive auditory measures between those with AR and healthy controls, pointing to a form of hidden hearing loss. The research, led by Shang Gao, Ping Liu, and Huifeng Li, suggests that chronic nasal allergy inflammation may have a direct, negative impact on the inner ear and auditory nerve function.

How the Study Measured Hidden Hearing Loss

This cross-sectional study, published in Frontiers in Pediatrics, enrolled 60 patients with AR and 30 matched healthy controls aged 12 to 18 between 2021 and 2023. The researchers moved far beyond a standard hearing check. They used a battery of specialized tests designed to probe different parts of the auditory system.

The assessment included pure-tone audiometry extended into the very high frequencies (up to 16 kHz), which are not tested in routine exams. They measured distortion product otoacoustic emissions (DPOAE) to check the health of the outer hair cells in the cochlea. Critically, they used electrocochleography (ECochG) to measure electrical potentials within the cochlea itself and auditory brainstem response (ABR) to assess the synchrony and strength of the nerve signal traveling to the brain. Finally, they administered speech-in-noise tests to evaluate functional hearing ability in a challenging, real-world scenario.

Evidence of Damage from the Inner Ear to the Brainstem

The results revealed a consistent pattern of auditory dysfunction in the AR group. In the extended high frequencies, they had significantly higher (worse) hearing thresholds from 9 to 16 kHz. Their DPOAE signal-to-noise ratios were lower at 6-10 kHz, indicating reduced outer hair cell activity in that region.

The neural data were particularly telling. At a moderate loudness level (80 dB nHL), the amplitude of Wave I in the ABR—which represents the initial firing of the auditory nerve—was significantly smaller in AR patients (0.25 µV vs. 0.39 µV). Wave V, generated in the brainstem, was also reduced (0.35 µV vs. 0.47 µV). A smaller Wave I with a normal Wave V ratio is a key indicator of cochlear synaptopathy, the primary mechanism of hidden hearing loss where the connections between hair cells and the auditory nerve are damaged.

Electrocochleography added another piece of evidence. The ratio of the Summation Potential (SP, related to cochlear fluid pressure) to the Action Potential (AP, the nerve response) was significantly larger in the AR group. An elevated SP/AP ratio is often associated with inner ear fluid imbalance and is a common finding in conditions like Ménière’s disease, suggesting the allergic inflammation may be affecting cochlear homeostasis.

Speech-in-Noise Struggle Confirms Functional Impact

The most practical confirmation of a problem came from the speech audiometry. Children and adolescents with allergic rhinitis had significantly greater signal-to-noise ratio loss. They needed the target speech to be much louder relative to background noise to understand it, compared to their healthy peers. This difficulty hearing in noisy environments, like a classroom or cafeteria, is the classic complaint associated with hidden hearing loss, even when a standard audiogram appears normal.

This functional deficit links the physiological findings to real-world hearing challenges. It also suggests a potential connection to broader auditory processing issues. For instance, the chronic neural disruption seen here could be one factor in the brain changes associated with hyperacusis, where the central auditory system becomes hyper-reactive to sound.

Implications for Managing Pediatric Allergy and Hearing Health

The study by Gao and colleagues makes a strong case that allergic rhinitis should be considered a potential risk factor for hearing damage in young people. The inflammation from AR, possibly mediated through the Eustachian tube or shared immune pathways, appears to create a state of cochlear stress that damages high-frequency function and neural connections.

For clinicians, this means that a normal basic audiogram may not be sufficient to rule out hearing problems in a symptomatic child with allergies. Referring for more detailed testing, such as extended high-frequency audiometry or speech-in-noise tests, could identify hidden deficits early. For parents and patients, understanding this link emphasizes the importance of consistent and effective allergy management, not just for nasal symptoms but for potential hearing protection.

Early identification is vital, as auditory deficits in youth can impact learning and social development. Furthermore, understanding these peripheral changes helps inform research into central auditory disorders. The neural patterns observed may contribute to the mechanisms explored in articles on a unified theory of tinnitus and hyperacusis, where peripheral damage initiates maladaptive central gain. This study adds allergic rhinitis to the list of conditions that require an integrated view of auditory health from the ear to the brain.

Source: Gao S, Liu P, Li H. Allergic rhinitis could lead to hearing impairment in children/adolescents manifested as hidden hearing loss. Front Pediatr. 2026. doi:10.3389/fped.2026.1752238.