Residency · Residency · Otolaryngology
Tinnitus: Evaluation and Management
Introduction
Tinnitus is the perception of sound in the absence of an external acoustic stimulus. It affects approximately 10-15% of the adult population and causes significant distress in 1-2%. Tinnitus is a symptom, not a diagnosis, and may reflect a wide range of underlying otologic, neurologic, vascular, or systemic conditions. A systematic evaluation is essential to identify treatable causes and guide management.
Classification
Subjective Tinnitus
Perceived only by the patient; accounts for >95% of cases. Most commonly associated with sensorineural hearing loss, Described as ringing, buzzing, hissing, or humming.
Objective Tinnitus
Audible to the examiner (with or without a stethoscope). Causes: pulsatile (vascular malformations, paragangliomas, carotid stenosis, dural AV fistulas, IIH) or non-pulsatile (palatal myoclonus, middle ear myoclonus, patulous Eustachian tube). Pulsatile tinnitus synchronous with heartbeat mandates vascular imaging.
By Duration
Acute: <6 months. Chronic: >6 months (more likely to become bothersome).
Pathophysiology
Central Gain Theory
Hearing loss reduces peripheral input from the cochlea. The central auditory system compensates by increasing neural gain (hyperexcitability). Spontaneous neural activity in the auditory cortex is perceived as tinnitus. Explains why most tinnitus accompanies hearing loss.
Additional Mechanisms
Cochlear damage: outer hair cell loss disrupts normal tonotopic signaling. Dorsal cochlear nucleus hyperactivity: abnormal firing patterns. Limbic system involvement: emotional response amplifies tinnitus perception (fear, anxiety, depression). Somatosensory modulation: TMJ disorders, cervical spine issues can modulate tinnitus in some patients.
Etiology
Otologic Causes
Noise-induced hearing loss: most common identifiable cause. Presbycusis: age-related hearing loss. Meniere disease: low-frequency tinnitus with fluctuating hearing loss, vertigo, aural fullness. Otosclerosis: conductive hearing loss with tinnitus. Vestibular schwannoma: unilateral tinnitus with asymmetric SNHL. Cerumen impaction or middle ear effusion.
Non-Otologic Causes
Ototoxic medications: aminoglycosides, cisplatin, salicylates, loop diuretics. TMJ dysfunction: tinnitus may be modulated by jaw movement. Cardiovascular: hypertension, atherosclerosis (pulsatile). Neurologic: multiple sclerosis, intracranial hypertension. Metabolic: thyroid disease, anemia, diabetes. Psychiatric comorbidity: anxiety, depression (both a cause and consequence).
Evaluation
History
Character: ringing, buzzing, pulsatile, clicking. Laterality: unilateral vs. bilateral; unilateral requires vestibular schwannoma workup. Duration and onset: sudden vs. gradual. Associated symptoms: hearing loss, vertigo, aural fullness, headache. Modulating factors: position changes, jaw clenching, loud noise. Medication history: ototoxic drugs. Impact assessment: sleep disturbance, concentration, emotional distress; validated questionnaires (THI — Tinnitus Handicap Inventory).
Physical Examination
Otoscopy: cerumen, TM abnormalities, middle ear mass (glomus tumor). Auscultation: periauricular and cervical bruit (pulsatile tinnitus). TMJ examination: crepitus, tenderness, malocclusion. Cranial nerve assessment: facial nerve, vestibulocochlear nerve. Valsalva maneuver and positional changes: effect on pulsatile tinnitus.
Audiologic Assessment
Comprehensive audiometry: air and bone conduction, speech discrimination. Tympanometry: middle ear pathology. Tinnitus pitch and loudness matching. Minimum masking level: determines the level of external sound needed to mask the tinnitus.
Imaging
MRI with gadolinium (IAC protocol): indicated for unilateral tinnitus, asymmetric hearing loss, or clinical concern for retrocochlear pathology (vestibular schwannoma). CT temporal bone: if pulsatile tinnitus with suspected glomus tumor, aberrant carotid, or dehiscent jugular bulb. CT/MR angiography: for pulsatile tinnitus to evaluate vascular causes (dural AV fistula, carotid stenosis, venous anomalies).
Management
| Treatment | Mechanism | Evidence Level | Best For |
|---|---|---|---|
| Hearing aids | Reduce central gain, amplify external sound | Strong | Tinnitus with hearing loss (first-line) |
| CBT | Reduce emotional response and catastrophizing | Strong (best evidence) | Tinnitus-related distress |
| TRT | Directive counseling + sound therapy for habituation | Moderate | Chronic bothersome tinnitus |
| Sound therapy | External enrichment, masking | Moderate | Nighttime symptoms, quiet environments |
| Antidepressants (SSRIs) | Treat comorbid anxiety/depression | Moderate | Tinnitus with psychiatric comorbidity |
| Neuromodulation (TMS, VNS) | Modulate auditory cortex excitability | Emerging | Refractory cases (investigational) |
Treatable Causes
Cerumen removal, otitis media treatment, ossicular chain repair. Vestibular schwannoma: appropriate management (observation, radiation, surgery). Glomus tumor: surgery or observation. Dural AV fistula: endovascular embolization. Medication adjustment: discontinue or reduce ototoxic drugs. TMJ therapy: dental splint, physical therapy.
Hearing Aids
Most effective intervention for patients with tinnitus and hearing loss. Amplification reduces the central gain imbalance that drives tinnitus perception. Even mild hearing loss should be treated when tinnitus is bothersome.
Sound Therapy
External sound enrichment: background noise, nature sounds, fans. Tinnitus maskers: wearable devices producing broadband noise. Combination devices: hearing aid + sound generator. Notched sound therapy: filtered music with energy removed at the tinnitus frequency.
Cognitive Behavioral Therapy (CBT)
Strongest evidence base for reducing tinnitus-related distress. Does not eliminate the tinnitus percept but reduces the emotional reaction. Addresses catastrophizing, sleep disruption, and avoidance behaviors. Can be delivered individually, in groups, or via internet-based programs.
Tinnitus Retraining Therapy (TRT)
Based on the neurophysiological model (Jastreboff). Combines directive counseling with sound therapy to promote habituation. Goal: reclassify tinnitus as a neutral signal, reducing limbic system activation. Requires 12-24 months of therapy.
Pharmacotherapy
No FDA-approved medication specifically for tinnitus. Antidepressants (SSRIs, tricyclics): may help when comorbid depression/anxiety is present. Benzodiazepines: short-term relief but not recommended long-term (habituation, dependence). Melatonin: may help with tinnitus-related sleep disturbance. Supplements (ginkgo biloba, zinc, B vitamins): insufficient evidence for routine use.
Emerging Therapies
Neuromodulation: transcranial magnetic stimulation (TMS), transcranial direct current stimulation (tDCS), vagus nerve stimulation paired with tones. Cochlear implants: for patients with severe/profound hearing loss and debilitating tinnitus. Pharmacologic targets: NMDA antagonists, potassium channel modulators (investigational).
Key Clinical Pearls
Unilateral tinnitus with asymmetric hearing loss requires MRI to rule out vestibular schwannoma. Pulsatile tinnitus synchronous with heartbeat demands vascular imaging (CTA/MRA). Hearing aids are the most effective first-line treatment for tinnitus patients with hearing loss. CBT has the strongest evidence for reducing tinnitus-related distress and should be offered to all patients with bothersome tinnitus. There is no FDA-approved drug for tinnitus — counsel patients against unproven supplements and treatments. Address comorbid depression, anxiety, and sleep disturbance as part of comprehensive tinnitus management.
References
- Tunkel DE, Bauer CA, Sun GH, et al. Clinical practice guideline: tinnitus. Otolaryngol Head Neck Surg. 2014;151(2 Suppl):S1-S40.
- Langguth B, Kreuzer PM, Kleinjung T, De Ridder D. Tinnitus: causes and clinical management. Lancet Neurol. 2013;12(9):920-930.
- Cima RFF, Maes IH, Joore MA, et al. Specialised treatment based on cognitive behaviour therapy versus usual care for tinnitus: a randomised controlled trial. Lancet. 2012;379(9830):1951-1959.
- Henry JA, Dennis KC, Schechter MA. General review of tinnitus: prevalence, mechanisms, effects, and management. J Speech Lang Hear Res. 2005;48(5):1204-1235.