Dizziness is among the most common presenting complaints in primary care and emergency medicine, and among the most frequently mismanaged. For the majority of patients with true vertigo — the illusion of rotational movement — the underlying cause is a benign disorder of the inner ear that responds well to specific physical maneuvers or vestibular rehabilitation therapy.

Distinguishing Vertigo from Dizziness: A Clinical Distinction That Matters

True vertigo is specifically the sensation that the environment is spinning or that the patient is rotating within a stationary environment — a compelling illusion of motion that is not occurring. It typically has an abrupt onset, often lasts seconds to minutes in its most common form, and may be accompanied by nausea, a sensation of fullness in the ear, or auditory symptoms.

Presyncope — the lightheaded, faint-feeling sensation associated with reduced cerebral perfusion — is a different symptom entirely. Disequilibrium, the sense of instability or imbalance when walking, is also distinct and often reflects central nervous system or musculoskeletal contributions rather than peripheral vestibular pathology.

Benign Paroxysmal Positional Vertigo: The Most Common Cause

BPPV is by far the most common cause of vertigo in adults, accounting for approximately 20 to 30 percent of all dizziness diagnoses. BPPV occurs when otoconia — calcium carbonate crystals that normally sit on the otolithic membrane of the utricle — become dislodged and migrate into one of the semicircular canals of the inner ear. The result is brief but intense positional vertigo — typically lasting less than sixty seconds — triggered by specific head movements such as rolling over in bed, looking up, or bending forward.

The diagnosis of BPPV is made clinically through the Dix-Hallpike maneuver (for posterior and anterior canal BPPV) or the supine roll test (for horizontal canal BPPV). The treatment for BPPV is the canalith repositioning procedure — most commonly the Epley maneuver for posterior canal involvement. A single Epley maneuver resolves BPPV in approximately 80 percent of patients, and most remaining cases resolve with one or two additional treatments.

Vestibular Neuritis and Labyrinthitis

Vestibular neuritis is an inflammatory condition of the vestibular nerve, most commonly attributed to viral or post-viral inflammation, that presents with sudden, severe, persistent vertigo lasting days to weeks. Unlike BPPV, the vertigo of vestibular neuritis is constant rather than positional.

The acute management typically involves short-term use of vestibular suppressants (such as meclizine or diazepam) to reduce the severity of symptoms during the first twenty-four to seventy-two hours, followed by early mobilization and vestibular rehabilitation therapy. The vestibular suppressants should not be continued beyond the acute phase because they impair the central compensation process.

Ménière's Disease: A Chronic Vestibular Condition

Ménière's disease is characterized by the classic triad of episodic vertigo (attacks typically lasting twenty minutes to several hours), fluctuating low-frequency sensorineural hearing loss, and tinnitus and/or aural fullness in the affected ear. The underlying pathophysiology is believed to involve endolymphatic hydrops — an excess accumulation of endolymph.

Initial management typically includes dietary sodium restriction (usually to less than 1,500 mg per day), reduction of caffeine and alcohol, and a diuretic such as triamterene-hydrochlorothiazide. For those with inadequately controlled attacks, intratympanic injection of corticosteroids or gentamicin represents a middle tier of intervention.

When to Seek Evaluation and What to Expect

Any new onset of vertigo, particularly when severe, persistent, or associated with neurological symptoms such as double vision, slurred speech, dysphagia, severe headache, or unilateral limb weakness, warrants prompt medical evaluation to rule out central causes, including posterior circulation stroke.

Comprehensive vestibular evaluation typically includes videonystagmography (VNG), which assesses oculomotor function and the integrity of both horizontal semicircular canals; vestibular evoked myogenic potentials (VEMP), which evaluate otolith function; and in some cases rotary chair testing.

A normal MRI is not a diagnosis — it is the starting point for appropriate vestibular evaluation.

References

  • Bhattacharyya, N. et al. (2017). "Clinical Practice Guideline: Benign Paroxysmal Positional Vertigo." Otolaryngology–Head and Neck Surgery. 156(3_suppl):S1–S47.
  • Furman, J.M., & Cass, S.P. (1999). "Benign Paroxysmal Positional Vertigo." NEJM. 341(21):1590–1596.