Ototoxicity: When Medications, Trauma, and Toxic Stress Affect Hearing, Balance, and Brain Function

Hearing and balance are often treated as separate from mental health, but they are deeply connected to the brain, nervous system, and daily functioning. When the auditory or vestibular system is disrupted, people may experience more than hearing loss. They may develop tinnitus, dizziness, imbalance, sensory overwhelm, difficulty concentrating, anxiety, fatigue, sleep disruption, and worsening trauma-related symptoms.

Ototoxicity refers to damage to the inner ear or auditory nerve caused by certain medications, chemicals, or toxic exposures. It may affect the cochlea, which supports hearing, the vestibular system, which supports balance and spatial orientation, or both (Ganesan et al., 2018; Kros & Steyger, 2019). In some cases, ototoxicity is temporary. In others, the damage may be permanent, especially when sensory hair cells in the inner ear are injured.

For military members, veterans, first responders, and individuals with a history of traumatic brain injury or chronic stress, ototoxicity deserves closer attention. Hearing, balance, and brain regulation are not isolated systems. They work together constantly to help the body feel oriented, safe, alert, and stable.

What Is Ototoxicity?

Ototoxicity occurs when a substance damages structures involved in hearing or balance. The inner ear contains delicate sensory hair cells that convert sound and movement into signals the brain can understand. These cells do not regenerate well in humans, which is why some forms of hearing loss or vestibular injury can be long-lasting or permanent (Kros & Steyger, 2019; Schacht et al., 2012).

Common ototoxic exposures include certain antibiotics, chemotherapy agents, loop diuretics, high-dose salicylates, quinine-related medications, and some environmental toxins. Aminoglycoside antibiotics and platinum-based chemotherapy agents such as cisplatin are among the best-known causes of clinically significant ototoxicity (Laurell, 2019; Schacht et al., 2012).

Ototoxicity can affect people differently depending on the medication, dose, duration of use, kidney function, genetic susceptibility, age, prior hearing status, concurrent ototoxic medications, noise exposure, and overall medical condition (Ganesan et al., 2018; Steyger, 2021).

How Ototoxicity Affects Hearing

When ototoxicity affects the cochlea, a person may experience:

• Hearing loss

• Tinnitus

• Sound sensitivity

• Difficulty understanding speech in noise

• A sense that people are mumbling

• Ear fullness or pressure

• Auditory fatigue

Hearing loss from ototoxic medications often begins in the higher frequencies, which may not be immediately obvious in ordinary conversation. A person may still “hear” sound but struggle to understand speech clearly, especially in noisy environments.

This is particularly important for military and first responder populations. Research on blast exposure and TBI has shown that auditory dysfunction can include peripheral hearing loss, tinnitus, central auditory processing difficulties, and problems understanding speech in complex environments (Fausti et al., 2009; Kuchinsky et al., 2020). This means someone may pass a basic hearing test but still struggle functionally in real-world listening environments.

How Ototoxicity Affects Balance and Vestibular Function

The vestibular system helps the brain understand movement, gravity, posture, and spatial orientation. When this system is affected, symptoms may include:

• Dizziness

• Vertigo

• Imbalance

• Motion sensitivity

• Nausea

• Visual tracking problems

• Feeling disoriented in busy environments

• Difficulty walking in the dark

• Increased fall risk

• Trouble tolerating stores, crowds, screens, or driving

Some ototoxic medications are more likely to affect vestibular function than hearing. For example, certain aminoglycosides, including gentamicin, streptomycin, and tobramycin, are associated with vestibular injury, while others may be more cochleotoxic (Aminoglycosides, 2023).

Vestibular dysfunction can be especially disruptive because balance is not just about the inner ear. The brain must integrate input from the vestibular system, vision, proprioception, the autonomic nervous system, and prior threat experiences. When those systems do not integrate well, the body may feel unstable, unsafe, or constantly on alert.

Why Ototoxicity Happens

Ototoxicity can occur through several mechanisms. Many ototoxic medications increase oxidative stress within inner ear tissues, damage sensory hair cells, disrupt mitochondrial function, or interfere with the blood supply and cellular signaling needed for inner ear health (Schacht et al., 2012; Steyger, 2021).

Risk may increase when a person has:

• Higher cumulative medication exposure

• Multiple ototoxic medications at once

• Impaired kidney function

• Prior noise or blast exposure

• Older age

• Genetic vulnerability

• Inflammation or systemic illness

• Previous hearing or vestibular problems

This is why monitoring matters. The American Academy of Audiology recommends baseline testing and follow-up monitoring when patients are receiving medications known to carry ototoxic risk (American Academy of Audiology, 2009).

Ototoxicity, PTSD, and TBI: Why the Overlap Matters

For many veterans and first responders, hearing and balance symptoms do not occur in isolation. They often occur alongside PTSD, TBI, sleep problems, headaches, visual dysfunction, chronic pain, and nervous system dysregulation.

Blast exposure and TBI are strongly associated with auditory and vestibular symptoms. Research in service members and veterans has shown that blast-related injury can involve hearing loss, tinnitus, vestibular impairment, and central auditory processing deficits (Fausti et al., 2009). A large study of more than 570,000 post-9/11 veterans found that TBI was associated with vestibular dysfunction and dizziness diagnoses (Swan et al., 2020). In veterans with chronic dizziness after mild TBI or blast exposure, researchers have identified measurable differences in vestibular and balance function compared with healthy controls (Akin et al., 2022).

PTSD may further complicate the picture. Veterans with worse PTSD symptoms have reported greater vestibular-related symptoms, suggesting that dizziness and balance complaints may be intertwined with trauma-related arousal, avoidance, and nervous system activation (Haber et al., 2016). This does not mean dizziness is “just anxiety.” It means the brain, body, balance system, and threat system can influence one another.

For someone with PTSD or TBI, vestibular symptoms can feel threatening. Dizziness, disorientation, tinnitus, and sensory overload may increase hypervigilance. Crowded stores, loud environments, fluorescent lighting, traffic, and unpredictable movement can become exhausting. Over time, people may begin avoiding environments that make them feel unstable, which can reinforce isolation and reduce quality of life.

How It Can Feel in Daily Life

Ototoxicity or vestibular dysfunction may show up as:

• “I feel off balance, but I can’t explain why.”

• “Crowded places overwhelm me.”

• “I get exhausted trying to listen.”

• “I hear people, but I can’t process what they are saying.”

• “My tinnitus gets worse when I’m stressed.”

• “Driving or scrolling makes me dizzy.”

• “I feel like my brain is working too hard to stay oriented.”

• “I avoid stores, restaurants, or crowds because I feel overstimulated.”

• “My anxiety spikes when I feel dizzy or disoriented.”

These symptoms can be misread as purely psychological. In reality, they may involve auditory processing, vestibular function, trauma physiology, autonomic regulation, and brain network stress.

Evaluation and Monitoring

Anyone experiencing hearing changes, tinnitus, dizziness, imbalance, or new sensitivity after medication exposure, blast exposure, TBI, or toxic exposure should be evaluated by appropriate medical professionals.

Depending on the situation, evaluation may include:

• Medication and exposure history

• Audiology testing

• High-frequency hearing testing

• Tinnitus assessment

• Vestibular testing

• Vision and oculomotor screening

• Neurologic evaluation

• Review of kidney function and medication risk

• Functional assessment of balance, gait, and daily limitations

Early recognition matters. In some cases, adjusting or discontinuing the medication may reduce further injury, but this should only be done under the direction of the prescribing clinician. For essential medications such as chemotherapy or serious infection treatment, the goal is not to stop care. The goal is to monitor, reduce risk when possible, and support function.

How Brain Treatment Center NoVA Can Help

At Brain Treatment Center NoVA, we view hearing, balance, trauma, and brain regulation as connected systems. We do not replace audiology, ENT, neurology, oncology, or emergency medical care. Instead, we work as part of a broader care team to help patients address the functional impact of these symptoms.

Our approach may include:

• Mental health counseling for PTSD, chronic stress, trauma, grief, and adjustment

• EMDR-informed trauma therapy when clinically appropriate

• Nervous system regulation strategies

• Occupational therapy focused on sensory processing, regulation, balance, and functional performance

• qEEG-guided neuromodulation when appropriate

• Functional health review to explore nutrition, inflammation, sleep, stress physiology, and recovery capacity

• Collaboration with medical providers, audiology, vestibular therapy, and other specialists when needed

For veterans, first responders, and high performers, symptoms like tinnitus, dizziness, sensory overwhelm, and sleep disruption can become deeply connected to trauma responses and identity disruption. The goal is not simply to “manage symptoms.” The goal is to understand what systems are under stress and build a plan that supports recovery, regulation, and function.

The Bottom Line

Ototoxicity is more than a hearing issue. It can affect balance, orientation, communication, emotional regulation, sleep, safety, confidence, and quality of life.

For individuals with PTSD, TBI, blast exposure, or chronic operational stress, auditory and vestibular symptoms can place additional strain on an already overloaded nervous system.

These symptoms deserve careful evaluation, not dismissal.

If you are experiencing hearing changes, tinnitus, dizziness, imbalance, or sensory overwhelm, it may be time to look deeper.

We Can Help.BTCNVA.com | 703-857-2560

References

Akin, F. W., Murnane, O. D., Hall, C. D., Riska, K. M., & Schubert, M. C. (2022). Vestibular and balance function in veterans with chronic dizziness associated with mild traumatic brain injury and blast exposure. Frontiers in Neurology, 13, 930389. https://doi.org/10.3389/fneur.2022.930389

American Academy of Audiology. (2009). Position statement and clinical practice guidelines: Ototoxicity monitoring. American Academy of Audiology.

Fausti, S. A., Wilmington, D. J., Gallun, F. J., Myers, P. J., & Henry, J. A. (2009). Auditory and vestibular dysfunction associated with blast-related traumatic brain injury. Journal of Rehabilitation Research and Development, 46(6), 797–810. https://doi.org/10.1682/JRRD.2008.09.0118

Ganesan, P., Schmiedge, J., Manchaiah, V., Swapna, S., Dhandayutham, S., & Kothandaraman, P. P. (2018). Ototoxicity: A challenge in diagnosis and treatment. Journal of Audiology & Otology, 22(2), 59–68. https://doi.org/10.7874/jao.2017.00360

Haber, Y. O., Chandler, H. K., Serrador, J. M., & Roma, P. G. (2016). Symptoms associated with vestibular impairment in veterans with posttraumatic stress disorder. PLOS ONE, 11(12), e0168803. https://doi.org/10.1371/journal.pone.0168803

Kros, C. J., & Steyger, P. S. (2019). Aminoglycoside- and cisplatin-induced ototoxicity: Mechanisms and otoprotective strategies. Cold Spring Harbor Perspectives in Medicine, 9(11), a033548. https://doi.org/10.1101/cshperspect.a033548

Kuchinsky, S. E., Vaden, K. I., Jr., Ahlstrom, J. B., Cute, S. L., Humes, L. E., Dubno, J. R., & Eckert, M. A. (2020). Objective and subjective auditory effects of traumatic brain injury and blast exposure in service members and veterans. Frontiers in Neurology, 11, 613. https://doi.org/10.3389/fneur.2020.00613

Laurell, G. (2019). Pharmacological intervention in the field of ototoxicity. HNO, 67(6), 434–439. https://doi.org/10.1007/s00106-019-0663-1

Schacht, J., Talaska, A. E., & Rybak, L. P. (2012). Cisplatin and aminoglycoside antibiotics: Hearing loss and its prevention. The Anatomical Record, 295(11), 1837–1850. https://doi.org/10.1002/ar.22578

Steyger, P. S. (2021). Mechanisms of ototoxicity and otoprotection. Hearing Research, 408, 108307. https://doi.org/10.1016/j.heares.2021.108307

Swan, A. A., Nelson, J. T., Swiger, B., Jaramillo, C. A., Eapen, B. C., Pugh, M. J., & Pugh, M. J. V. (2020). Association of traumatic brain injury with vestibular dysfunction and dizziness in post-9/11 veterans. Journal of Head Trauma Rehabilitation, 35(6), E515–E523. https://doi.org/10.1097/HTR.0000000000000584