Tinnitus Evaluation and Management

Primary Underlying Mechanisms

The American College of Radiology recommends considering sensorineural hearing loss as the single most common underlying cause of tinnitus, particularly in patients with bothersome tinnitus and no obvious ear pathology, with age-related hearing loss (presbycusis) and noise-induced hearing loss being common causes 1
Sensorineural hearing loss occurs through progressive degeneration of hair cells in the cochlea, typically affecting high-frequency perception first, which is extremely common at age 54 1
Cochlear synaptopathy ("hidden hearing loss") is an irreversible degeneration of auditory nerve fibers without affecting outer hair cells, leading to difficulty understanding speech in noisy environments despite normal audiometry 1

Otosclerosis can cause conductive hearing loss that can trigger tinnitus 1
Menière's disease is characterized by episodic vertigo, fluctuating hearing loss, and tinnitus 1
Sudden sensorineural hearing loss requires urgent evaluation and treatment 1
Ototoxic medications can cause or worsen tinnitus, and many drugs have been identified as ototoxic 2

Pulsatile tinnitus has an identifiable structural or vascular cause in over 70% of cases and requires urgent imaging evaluation, with life-threatening causes including atherosclerotic carotid artery disease, idiopathic intracranial hypertension, dural arteriovenous fistulas, arterial dissection, and paragangliomas (glomus tumors) 3
The American College of Radiology recommends determining whether the tinnitus is pulsatile or non-pulsatile, as this fundamentally changes the diagnostic approach and urgency 3

Otoscopic examination can identify cerumen impaction, middle ear infection, or retrotympanic masses that explain the tinnitus 5, 4
Neurologic examination is essential, as focal deficits change the diagnostic approach entirely 3
Comprehensive audiologic examination, including pure tone audiometry, speech audiometry, and acoustic reflex testing, should be obtained within 4 weeks for any unilateral or persistent tinnitus 3

Imaging should be ordered for unilateral or asymmetric tinnitus, pulsatile tinnitus, tinnitus with focal neurologic deficits, tinnitus with asymmetric hearing loss, and objective tinnitus (audible to examiner) 4, 3, 2
The American College of Radiology recommends against imaging for bilateral, symmetric, non-pulsatile tinnitus without localizing features, as this represents low-yield, expensive testing with potential harms 2, 4, 3

Determine if tinnitus is pulsatile or non-pulsatile 3
Perform otoscopic examination to identify obvious causes 5, 4
Assess for unilateral vs. bilateral presentation 4
Order comprehensive audiologic examination within 4 weeks 3
If bilateral, symmetric, non-pulsatile with normal exam: no imaging needed; likely presbycusis or noise-induced hearing loss 2, 4
If unilateral, pulsatile, or with neurologic deficits: proceed to appropriate imaging (MRI for unilateral non-pulsatile; CT/CTA for pulsatile) 4, 3