Otorhinolaryngology — Hearing and Ear Pathologies
Tinnitus: Causes, Diagnosis, and Treatments - Clinique Omicron
Tinnitus, from the Greek to hear (to hear) and from Latin tinning (ringing) refer to the conscious perception of a sound in the absence of any identifiable external sound source. These sounds can include buzzing, whistling, ringing, rumbling, clicking, pulsing, or more complex sounds, perceived in one ear, both ears, or inside the head. They can be continuous or intermittent, steady or fluctuating, and their subjective intensity varies considerably from one individual to another. In Canada, it is estimated that approximately 15 to 20% of the adult population experiences tinnitus at some point in their lives, with 1 to 3% reporting discomfort severe enough to significantly impair their quality of life, sleep, concentration, and emotional well-being. Tinnitus is not a disease in itself, but a symptom that may indicate a disorder at any level of the auditory system, from the outer ear to the auditory cortex, or result from a systemic, vascular, or medication-related cause. In most cases, a thorough evaluation allows for the identification of the cause, the determination of appropriate management, and the distinction between benign forms and those requiring urgent or specialized investigation.
Consult without delay in the presence of the following signs
Certain types of tinnitus require urgent medical evaluation. See a doctor promptly or go to the emergency room if your tinnitus is accompanied by sudden unilateral hearing loss (occurring within 72 hours), intense and disabling vertigo, sudden severe headaches, neurological signs (vision problems, limb weakness, difficulty speaking, numbness), ear discharge, or a recent head injury. Unilateral pulsatile tinnitus that is synchronous with your pulse should also be evaluated immediately to rule out a vascular cause.
Tinnitus Classification
Tinnitus classification is based on two main criteria: its subjective or objective nature, and the presumed physiopathological mechanism at its origin. This distinction guides the entire diagnostic process.
| Type | Definition | Frequency | Main causes |
|---|---|---|---|
| Subjective tinnitus | Perceived only by the patient; cannot be heard by the examiner; result from abnormal neural activity in the central or peripheral auditory pathways | 95% to 97% of cases | Presbycusis, noise exposure, ototoxic medications, Ménière's disease, acoustic neuroma, otosclerosis, central causes |
| Objective tinnitus (somatosounds) | Produced by a real sound source in the vicinity of the ear; can be heard by the examiner with a stethoscope placed near the external auditory canal | 3 to 5 cases of % | Pulsatile vascular tinnitus (arterial stenosis, arteriovenous malformation, jugulotympanic paraganglioma), muscle contractions (palatal or stapedial myoclonus), Eustachian tube dysfunction |
| Tonal tinnitus | Pure or nearly pure, of an identifiable frequency; often a high-pitched whistle | Majorities in subjective tinnitus | Localized cochlear damage (hair cells); tinnitus frequency often correlates with the area of hearing loss |
| Non-tonal tinnitus | Broadband noise, humming, rumbling, rustling; no clear dominant frequency | Frequent in diffuse cochlear damage | Advanced presbycusis, cochlear vascular damage, inactive Ménière's disease |
| Pulsatile tinnitus | Perceived in sync with the heartbeat; can be subjective or objective depending on the cause | 5 to 10 % of tinnitus | High blood pressure, severe anemia, hyperthyroidism, jugular paraganglioma, carotid stenosis, arteriovenous malformation, idiopathic intracranial hypertension (pseudotumor cerebri) |
Causes and triggers
| Category | Causes | Mechanism |
|---|---|---|
| Noise exposure | Sudden loud noise trauma (explosion, concert, gunshot) or chronic exposure (noisy work environment, amplified music through headphones); the most common cause of tinnitus in young adults | Mechanical and then metabolic damage to outer hair cells of the cochlea at the basilar membrane; deafferentation of auditory nerve fibers leading to compensatory neuronal hyperactivity in the central auditory pathways |
| Presbycusis | Age-related symmetric bilateral hearing loss affecting high frequencies; main cause of tinnitus in individuals over 60 years of age | Progressive degeneration of cochlear hair cells and the cochlear nerve; chronic deafferentation leading to central recalibration with the emergence of phantom auditory perceptions |
| Ototoxic medications | Aminosides (gentamicin, tobramycin), cisplatin and platinum salts (chemotherapy), high-dose furosemide, high-dose acetylsalicylic acid (aspirin) (above 2-3 g/day), quinidine, chloroquine, certain NSAIDs | Direct toxicity on cochlear hair cells (especially outer) and on the stria vascularis; generally reversible upon discontinuation of the drug for aspirin and NSAIDs; often irreversible for aminoglycosides and cisplatin |
| Meniere's disease | Classic triad: often severe and fluctuating tinnitus, unilateral fluctuating sensorineural hearing loss, intermittent rotational vertigo; aural fullness | Endolymphatic hydrops with distension of the membranous labyrinth; fluctuation of endolymphatic pressure leading to repeated episodes of cochlear and vestibular dysfunction |
| Acoustic neuroma (vestibular schwannoma) | Benign tumor of the vestibulocochlear nerve (VIII); unilateral tinnitus associated with asymmetrical hearing loss and sometimes balance disorders; to be systematically considered in the case of any persistent unilateral tinnitus | Mechanical compression of cochlear nerve fibers by the tumor; altered nerve conduction and focal deafferentation |
| Otosclerosis | Fixation of the stapes by an osteodystrophy of the otic capsule; progressive bilateral conductive hearing loss; often severe tinnitus resembling buzzing | Stapes fixation; impaired vibratory transmission to the cochlea; enzymatic activity of otosclerotic foci potentially affecting labyrinthine fluids directly |
| Pathologies of the external and middle ear | Occlusive earwax plug, otitis externa, acute or serous otitis media (seromucous otitis), tympanic perforation, cholesteatoma | Modification of acoustic transmission conditions to the cochlea; occlusion of the external auditory canal reducing ambient background noise and making endogenous tinnitus more perceptible |
| Vascular and systemic causes | Poorly controlled high blood pressure, severe anemia, hyperthyroidism, glomus jugulare or tympanic paraganglioma, carotid stenosis, dural arteriovenous fistula, idiopathic intracranial hypertension | Vascular turbulence near the inner ear perceived directly; increased blood flow (anemia, thyrotoxicosis); vascular compression of the auditory nerve |
| Joint and muscle causes | Temporomandibular dysfunction (TMD); bruxism; cervical muscle tension; tinnitus often modulable by jaw or neck movements (somatosensory tinnitus) | Somatosensory interactions with the cochlear nuclei via trigeminal and cervical pathways; modulation of central cochlear neuronal activity by somatosensory afferents |
| Central Causes | Multiple sclerosis (involvement of central auditory pathways), brainstem or temporal cortex stroke, posterior fossa tumors | Dysfunction of the central auditory pathways with central generation of abnormal auditory perceptions; partial deafferentation of the auditory centers |
Pathophysiology of chronic subjective tinnitus
Modern understanding of subjective tinnitus goes beyond the initial concept of a simple peripheral cochlear lesion. Current physiopathological models emphasize the central role of the auditory nervous system and interactions between auditory pathways and the limbic and attentional systems.
The best-supported neurophysiological theory proposes that tinnitus results from spontaneous neuronal hyperactivity in the cochlear nuclei or in the auditory structures of the brainstem (inferior colliculus, medial geniculate body), secondary to partial deafferentation of the auditory nerve fibers. In the absence of normal peripheral input, central auditory neurons increase their gain in a compensatory manner, generating spontaneous activity perceived as sound. This phenomenon is analogous to phantom limb pain observed after limb amputation. The persistence and suffering associated with tinnitus result from a feedback loop involving the limbic system (amygdala, hippocampus) and the prefrontal cortex: tinnitus perceived as threatening or anxiogenic activates alert systems in turn, increasing attention to the internal sound and reinforcing its conscious perception.
ℹ️
The objective intensity of tinnitus, measured during audiological assessment by tinnitus matching, is generally very low: it rarely exceeds 5 to 10 dB above the hearing threshold at the corresponding frequency. This low intensity often contrasts with the considerable subjective distress reported by severely affected patients, illustrating the predominant role of attention, anxiety, and central emotional processing mechanisms in the functional impact of tinnitus, regardless of its actual acoustic level.
Diagnostic assessment
| Review | Information obtained | Specific indications |
|---|---|---|
| Detailed anamnesis | Characteristics of tinnitus (pitch, laterality, duration, fluctuation, pulsatility), triggers and aggravating factors, impact on sleep and quality of life, history of noise exposure, list of medications, ENT history | Systematic; guides the entire assessment; unilateral, pulsatile tinnitus or tinnitus associated with other neurological symptoms necessitates priority specialist investigation |
| Otoscopy | Examination of the external auditory canal and tympanic membrane; detection of impacted cerumen, external otitis, tympanic perforation, middle ear effusion (seromucous otitis), or a mass (cholesteatoma, paraganglioma). | Systematic; first exam to perform; immediately resolves benign obstructive causes |
| Threshold tonal audiometry | Hearing thresholds at frequencies from 250 Hz to 8,000 Hz, by air and bone conduction; identification and quantification of hearing loss (conductive, sensorineural, or mixed); audiometric asymmetry between the two ears | Systematic in all tinnitus assessments: an audiometric asymmetry greater than 15 dB on two consecutive frequencies justifies an MRI of the internal auditory canal. |
| Tinnitus assessment | Measurement of the tinnitus frequency (in Hz) and intensity (in dB); evaluation of residual inhibition (silence post-tinnitus measurement); partial objectification of the subjective symptom | Performed during the specialized audiological assessment; useful for monitoring progress and evaluating therapeutic effectiveness |
| Impedance audiometry (tympanometry and stapedial reflex) | Evaluation of tympanic mobility and ossicular chain; detection of middle ear effusion, otosclerosis (absent reflex), eustachian tube dysfunction; stapedial myoclonus visible in dynamic tympanometry | Systematic with audiometry; essential for distinguishing conductive and sensorineural hearing loss |
| Internal auditory canal MRI with gadolinium injection | Visualization of the vestibulocochlear nerve and internal auditory canal; detection of a vestibular schwannoma (acoustic neuroma), vascular compression of the auditory nerve, and central lesions of the auditory pathways | Indicated in cases of persistent unilateral tinnitus (over 3 months), significant audiometric asymmetry, or suspected schwannoma; reference examination to rule out a tumorous cause |
| Vascular assessment (CT angiography or MR angiography of the neck and brain) | Examination of the carotid and vertebral arteries and dural venous sinuses; detection of carotid stenosis, arteriovenous malformation, paraganglioma, or dural venous sinus thrombosis | Indicated in cases of pulsatile tinnitus; guided by clinical examination (neck auscultation, neck palpation, ophthalmic examination in case of suspected intracranial hypertension) |
| Targeted biological evaluation | Complete blood count (anemia), TSH (thyroid dysfunction), blood glucose, lipid profile, syphilis serology (VDRL-TPHA) if suspected; blood electrolytes | Clinically oriented; systematic if there is pulsatile tinnitus (anemia, hyperthyroidism) or suspicion of a systemic cause |
| Impact assessment (validated questionnaires) | Tinnitus Handicap Inventory (THI): 25 questions evaluating functional, emotional, and catastrophic impact; Tinnitus Functional Index (TFI); visual analog scale for intensity and annoyance | Systematic in specialized practice; grades impact from grade 1 (negligible tinnitus) to grade 4 (catastrophic tinnitus); guides therapeutic decisions and follow-up |
Impact and quality of life
For the vast majority of people affected, tinnitus is a mild to moderate nuisance that gradually subsides due to the process of neurological habituation, through which the central nervous system learns to filter out and downplay the unwanted auditory signal. However, for 1 to 3 out of every 100 patients, tinnitus becomes debilitating and significantly impairs quality of life in several areas.
- Sleep disorders: difficulty falling asleep, nocturnal awakenings, non-restorative sleep; tinnitus, not masked by ambient noise in the silence of the night, becomes particularly prominent and anxiety-provoking.
- Difficulties with concentration and working memory: divided attention between the tinnitus and a cognitive task reduces intellectual and professional performance, particularly in quiet environments.
- Emotional and psychiatric effects: anxiety, irritability, frustration; increased risk of clinical depression in severe, chronic cases (prevalence of depression among patients with severe tinnitus estimated at 25–60% depending on the study); in rare cases, suicidal ideation linked to exhaustion and the hope for a curative treatment
- Relationship and professional difficulties: social isolation, difficulty participating in conversations in noisy environments, work absences in professions requiring sustained attention
- Associated hyperacusis: painful hypersensitivity to everyday sounds, present in 40 to 60% of patients with significant chronic tinnitus; exacerbates social isolation and functional impairment
Therapeutic support
To date, there is no drug treatment that has demonstrated a curative effect on subjective tinnitus in high-level randomized clinical trials. Management focuses on approaches aimed at promoting habituation, reducing emotional impact, and improving quality of life, rather than suppressing the tinnitus itself.
| Therapeutic approach | Terms and conditions | Level of evidence and effectiveness |
|---|---|---|
| Treatment of the underlying cause | Removal of earwax, treatment of serous otitis (tympanostomy tubes), correction of hypothyroidism or anemia, discontinuation of an ototoxic medication, surgical treatment of otosclerosis, removal of a schwannoma, correction of high blood pressure | Priority approach when a cause is identified and treatable; can eliminate or significantly reduce tinnitus in secondary forms; ineffective in idiopathic forms or those related to irreversible cochlear damage |
| Sound therapy and white noise generators | Continuous exposure to neutral background noise (white noise, nature sounds, soft music) at a volume slightly lower than the tinnitus; in-ear noise generators; dedicated mobile applications (Tinnitus Sound, Resound Relief, Widex Moment Zen) | Proven efficacy in facilitating habituation and reducing the perceptual salience of tinnitus; particularly useful for improving sleep onset; recommended as first-line in North American and European guidelines |
| Tinnitus Retraining Therapy (TRT) | Combination of neurophysiological counseling (explanation of the neurophysiological model of tinnitus to reduce the emotional component and distress reaction) and individualized long-term sound therapy (18 to 24 months) | Well-established effectiveness in reducing feedback and promoting habituation; improvement in the THI in 70 to 80% of patients after 18 months; requires a rigorous protocol and regular follow-up by a trained audiologist |
| Cognitive Behavioral Therapy (CBT) | Restructuring of catastrophic thoughts related to tinnitus, relaxation techniques, gradual exposure to situations avoided due to tinnitus; individual or group CBT; online CBT (validated digital programs) | Highest level of evidence among non-auditory approaches; significantly reduces anxiety, depression, and functional impact (average THI reduction of 15 to 20 points); recommended as first-line treatment for tinnitus with significant emotional burden |
| Hearing aids | Hearing aids in patients with concomitant hearing loss; amplification of environmental sounds that partially mask tinnitus and reduce peripheral auditory deafferentation; some devices combine amplification and sound therapy generation (e.g., Widex Zen, Signia Notch Therapy). | Highly effective in cases of significant hearing loss (greater than 25 dB); improves the Tinnitus Handicap Index (THI) and tinnitus-related distress in 60 to 70% of cases; indicated as soon as hearing loss is documented, regardless of whether a hearing aid is requested for the hearing loss itself |
| Symptomatic medication | Anxiolytics (benzodiazepines) or antidepressants (SSRIs, tricyclics) used in a targeted and temporary manner to treat associated anxiety or depression, not tinnitus itself; low-dose melatonin for sleep disorders related to tinnitus | No medication has demonstrated efficacy for tinnitus itself; benzodiazepines are contraindicated for long-term use due to the risk of dependence; antidepressants improve the emotional impact without reducing the intensity of tinnitus; use under medical supervision. |
| Repetitive transcranial magnetic stimulation (rTMS) and neurostimulation | Non-invasive stimulation of auditory cortical areas (temporal cortex) and the prefrontal cortex using pulsed magnetic fields; bimodal neuromodulation (auditory and electrical combination) with devices such as Lenire (tDCS + sound) | Promising results in some clinical trials but significant inter-individual variability; Lenire approved by Health Canada in 2022 for moderate to severe tinnitus; not reimbursed by the RAMQ; further studies underway to define optimal responder subgroups |
ℹ️
Numerous products and dietary supplements are widely marketed for tinnitus (Ginkgo biloba, zinc, magnesium, high-dose melatonin, various homeopathic preparations). To date, none of these products have demonstrated efficacy superior to placebo in rigorous clinical trials for reducing the intensity or impact of tinnitus. Ginkgo biloba, often cited, has been the subject of several meta-analyses concluding a lack of significant benefit. Patients wishing to use these complementary approaches should inform their doctor due to possible drug interactions (particularly anticoagulants for Ginkgo biloba).
Prevention
The vast majority of post-traumatic and noise-exposure-related tinnitus is preventable. Prevention relies on simple and effective measures, the rigorous application of which would significantly reduce the incidence of this condition, particularly among young adults and in high-risk professional environments.
- Systematic wearing of individual hearing protection in any environment exceeding 85 dB(A) for prolonged exposure: custom-molded earplugs or approved earmuffs depending on the workstation; a legal requirement in Quebec under the Regulation respecting occupational health and safety (RSST).
- Limiting the volume when using headphones and in-ear earbuds: the 60/60 rule recommended by the World Health Organization (maximum volume of 60 dB for 60 consecutive minutes); use of active noise-canceling headphones to avoid turning up the volume in noisy environments
- Prolonged avoidance of very loud environments (clubs, concerts, bars) or wearing filtered earplugs (flat-attenuation protectors that preserve music quality) in recreational settings.
- Regular audiological surveillance for noise-exposed workers: annual audiogram recommended for workers in regulated areas above 85 dB(A), allowing early detection of an audiometric notch before the onset of permanent tinnitus.
- Optimization of cardiovascular support: management of arterial hypertension, treatment of dyslipidemia and diabetes, to reduce the risk of internal ear vascular damage
- Drug vigilance: report any tinnitus that appears when starting a new medication; discuss with your doctor before starting high-dose vitamin C supplementation in a patient at risk of hearing loss.
Consult at Clinique Omicron
Clinique Omicron physicians, at their service points in Quebec, provide the initial evaluation for any patient presenting with tinnitus, whether it's a first episode or a chronic, worsening annoyance. The consultation includes a complete otoscopic examination, a detailed medical history of the tinnitus's characteristics and impact, as well as a prescription for a comprehensive audiological assessment by a partner audiologist, including tonal audiometry, tinnitus matching, and impedance audiometry. In cases of audiometric asymmetry, persistent unilateral tinnitus, or pulsatile tinnitus, our practitioners initiate a request for an MRI of the internal auditory canal and arrange a referral to specialized ENT (Ear, Nose, and Throat) services. For tinnitus with significant emotional impact, coordination with psychology services or audiology specialized in Tinnitus Retraining Therapy (TRT) is facilitated from our Quebec branches. Teleconsultation is available for assessing the impact and initial therapeutic guidance. Book an appointment at one of our service points on the South Shore or at one of our Quebec branches.
The content of this page is provided for informational purposes only and is not intended to replace the advice of a qualified healthcare professional. Consult a physician for any symptoms, questions or decisions you may have regarding your health.
Omicron Clinic
Need to consult a doctor?
Treatment within 24-48 hours. In-clinic or telemedicine, anywhere in Quebec.
Insurance receipts. 7j/7. No family doctor required.