5Auscultation and Inspection for Objective Tinnitus

FObjective versus subjective tinnitus

The overwhelming majority of tinnitus is subjective — a percept generated within the auditory system that only the patient hears. A small but important minority is objective: a real acoustic event in or near the ear that an examiner can detect with a stethoscope, a Toynbee (listening) tube, or simply by watching. Objective tinnitus splits into two families: vascular (pulse-synchronous bruits and hums from turbulent blood flow) and myogenic / mechanical (rhythmic clicks from palatal or middle-ear muscle contraction, or patulous-tube breath sounds) [2013].

The reason to hunt for it is that objective tinnitus usually has a findable, often treatable, cause — a dural fistula, a glomus tumour, a high-riding jugular bulb, palatal myoclonus — rather than the diffuse central-gain mechanisms that drive subjective tinnitus.

TAuscultation: where to listen and how

Auscultate in a quiet room with the bell pressed lightly against skin. Cover, in turn, the periauricular region and external canal (a Toynbee tube or the bell over the meatus), the mastoid, the orbit (eyes gently closed, listening for an orbital bruit), the neck over the carotid bifurcation and along its course, and the skull/calvarium. Ask the patient to hold their breath briefly to remove breath sounds, and watch whether any sound is synchronous with the pulse — the hallmark of a vascular source.

Two bedside manoeuvres sharpen the yield: light ipsilateral jugular compression or a contralateral head turn that abolishes a venous hum suggests a benign venous origin (high-riding bulb, sigmoid-sinus dehiscence), whereas an arterial bruit persists and may intensify. A pulse-synchronous bruit over neck, mastoid or orbit mandates vascular imaging (CTA/MRA) to exclude a dural arteriovenous fistula or carotid pathology [2014].

TInspection: the palate and the eardrum

Not all objective tinnitus is heard — some is seen. With the mouth open, watch the soft palate for rhythmic, often bilateral contractions at roughly 1–3 Hz: palatal myoclonus (palatal tremor), which opens and closes the Eustachian tube and produces an audible click the examiner can sometimes hear at the meatus and the patient localises to the ear [2022]. Essential palatal tremor abolishes during sleep and may stop on jaw opening; symptomatic forms (brainstem/olivary lesions) persist.

Under the microscope or otoscope, watch the tympanic membrane for fine rhythmic flutter: middle-ear myoclonus from involuntary tensor tympani or stapedius contraction, perceived as clicking, fluttering or a low buzz that is irregular and not pulse-synchronous [2025]. A drum that moves with the pulse, by contrast, points back to a vascular cause — a glomus or aberrant carotid behind a thinned membrane — and must not be probed.

CDocumenting objective tinnitus

Because objective tinnitus is a genuine sign, it should be recorded the way any sign is: site heard (canal/mastoid/orbit/neck/skull), quality (continuous hum, harsh systolic bruit, rhythmic click), rhythm (pulse-synchronous vs irregular myogenic), laterality, and response to manoeuvres (jugular compression, head turn, breath-hold, jaw opening, palate observation). Note whether it was audible to the examiner, visible (palate/TM), or both.

This structured description is what triages the patient: pulse-synchronous and audible → vascular imaging; rhythmic click with visible palatal or TM movement → myoclonus pathway and, where appropriate, brain imaging to exclude a central cause [2013]. Where the examiner hears nothing despite a convincing pulsatile history, the tinnitus is classed as subjective pulsatile — still investigated, but the negative auscultation is itself a documented finding [2014].