Etiology and Management of Unilateral Tinnitus

Primary Etiologies

Unilateral tinnitus that worsens with yawning is most commonly caused by temporomandibular joint dysfunction, eustachian tube dysfunction, or vascular abnormalities that are exacerbated by jaw movement during yawning, according to the American College of Radiology 1, 2
TMJ derangement or dysfunction can cause unilateral tinnitus that worsens with jaw movements like yawning due to the close anatomical relationship between the TMJ and the ear structures 3
Vascular abnormalities near the ear can produce sounds that become more audible during yawning due to changes in blood flow patterns, with potential etiologies including sigmoid sinus diverticulum or dehiscence, high jugular bulb or jugular bulb dehiscence, persistent petrosquamosal sinus, arteriovenous malformations or fistulas, and carotid artery abnormalities 1, 2
Paragangliomas (glomus tumors) in the middle ear can cause pulsatile tinnitus that may be affected by position changes during yawning 2
Superior semicircular canal dehiscence can cause sound-induced or pressure-induced tinnitus 2

Determine if the tinnitus is pulsatile or non-pulsatile, as this helps differentiate vascular from non-vascular causes, according to the American College of Radiology 1, 2
Perform a targeted history and physical examination to identify conditions that if promptly managed may relieve tinnitus, as recommended by the American Academy of Otolaryngology-Head and Neck Surgery 4, 5
Comprehensive otologic examination to check for retrotympanic masses or vascular abnormalities is recommended by the American College of Radiology 1
Obtain a prompt, comprehensive audiologic examination for unilateral tinnitus, as recommended by the American Academy of Otolaryngology-Head and Neck Surgery 4, 5
For unilateral tinnitus, imaging studies are indicated, including CT temporal bone for suspected bony abnormalities or middle ear pathology, and MRI with contrast if acoustic neuroma or other retrocochlear pathology is suspected, according to the American College of Radiology 1, 2

Treatment should target the underlying cause rather than just symptom management, with options including addressing TMJ dysfunction through dental/jaw therapies, surgical repair or embolization for vascular causes, and other targeted therapies 2, 3
For TMJ-related tinnitus, addressing the TMJ dysfunction through dental/jaw therapies may help, as recommended by Praxis Medical Insights 3
For vascular causes, surgical repair or embolization may be indicated in severe cases, according to Praxis Medical Insights 2

Unilateral tinnitus requires more thorough investigation than bilateral tinnitus due to higher risk of underlying pathology, as recommended by the American Academy of Otolaryngology-Head and Neck Surgery 4, 5
Tinnitus that changes with body position or maneuvers (like yawning) often suggests a mechanical or vascular etiology rather than sensorineural causes
Do not routinely recommend medications like antidepressants or anxiolytics without addressing the underlying cause, as recommended by the American Academy of Otolaryngology-Head and Neck Surgery 4, 5
Dietary supplements like Ginkgo biloba, melatonin, or zinc are not recommended as primary treatment, according to the American Academy of Otolaryngology-Head and Neck Surgery 4, 5