What is the difference between dizziness and vertigo?

Dizziness is a broad term for sensations of unsteadiness, lightheadedness, or disorientation, whereas vertigo specifically refers to an illusion of movement, typically spinning. Vertigo more often points to the vestibular system, though careful evaluation is needed because causes range widely.

What is the most common cause of vertigo from the inner ear?

Benign paroxysmal positional vertigo, in which displaced inner-ear crystals provoke brief episodes of vertigo with changes in head position, is the most common inner-ear cause of vertigo. This entry describes the condition in general reference terms and is not individual medical advice.

Dizziness and Vertigo Syndromes

Dizziness and vertigo are common symptoms that bring patients to primary care, emergency departments, and otolaryngology. Vertigo specifically denotes an illusion of movement, usually spinning, and often reflects disease of the inner-ear balance organs or their central connections. The major peripheral (inner-ear) causes include benign paroxysmal positional vertigo, Meniere's disease, and vestibular neuritis, but dizziness can also arise from central neurological, cardiovascular, and other systemic causes, making careful characterisation important.

Definition

Dizziness and vertigo syndromes are the disorders that present with vertigo (an illusion of self- or surround-motion) or related dizziness and imbalance, arising from dysfunction of the peripheral vestibular apparatus, the vestibular nerve, or central vestibular pathways.

Scope

This topic groups the common vestibular and dizziness syndromes encountered in otolaryngology and general practice, distinguishing peripheral (inner-ear) from central causes and outlining the best-characterised entities such as benign paroxysmal positional vertigo and Meniere's disease. It is a reference entry describing how these syndromes are categorised and how peripheral and central causes are distinguished; it does not provide diagnostic algorithms or treatment instructions.

Key concepts

Vertigo versus non-specific dizziness
Peripheral versus central vestibular causes
Benign paroxysmal positional vertigo (BPPV)
Meniere's disease
Vestibular neuritis
Acute vestibular syndrome
Nystagmus
Semicircular canals and otolith organs

Mechanisms

The vestibular apparatus of the inner ear comprises three semicircular canals that sense rotational head movement and the otolith organs that sense linear acceleration and gravity; signals travel via the vestibular nerve to brainstem and cerebellar centres that coordinate balance and eye movements. A mismatch between vestibular inputs, or between vestibular and visual and proprioceptive inputs, is perceived as vertigo. In benign paroxysmal positional vertigo, displaced otoconia (calcium-carbonate crystals) move within a semicircular canal and trigger brief positional vertigo. In Meniere's disease, episodic vertigo with fluctuating hearing loss and tinnitus is associated with disordered inner-ear fluid regulation. Acute vestibular syndrome - sudden, persistent vertigo with nystagmus and imbalance - may be peripheral (vestibular neuritis) or central (brainstem or cerebellar stroke), and bedside oculomotor examination helps distinguish them.

Clinical relevance

Because dizziness and vertigo have causes ranging from benign inner-ear conditions to stroke, the way these syndromes are categorised and how peripheral and central causes are distinguished is clinically important. This entry frames that classification for reference and education; it is not a diagnostic protocol and does not provide treatment recommendations for individual patients.

Epidemiology

Dizziness and vertigo are among the most frequent symptoms in adult primary care and emergency settings, with lifetime prevalence of vertigo estimated in the range of several percent of the population. Benign paroxysmal positional vertigo is the most common cause of vertigo of inner-ear origin, and its prevalence rises with age. Meniere's disease and vestibular neuritis are less common but well-characterised peripheral vestibular disorders.

History

Modern vestibular medicine grew from nineteenth-century descriptions of the labyrinth and Prosper Meniere's account linking episodic vertigo to the inner ear, followed by the physiology of the semicircular canals. The twentieth and twenty-first centuries saw the characterisation of benign paroxysmal positional vertigo and its repositioning treatments, consensus diagnostic criteria for Meniere's disease, and bedside oculomotor approaches to separating peripheral from central acute vertigo.

Debates

How can central causes of acute vertigo be distinguished from peripheral ones at the bedside?: A structured three-step oculomotor examination has been reported to identify central causes such as stroke in acute vestibular syndrome with high sensitivity, sometimes exceeding early imaging, but its performance depends on examiner training and patient selection.
How should Meniere's disease be defined?: International consensus criteria define definite and probable Meniere's disease by episodic vertigo with documented fluctuating hearing loss and aural symptoms, but overlap with vestibular migraine and other disorders makes diagnosis a continuing challenge.

Seminal works

bhattacharyya-bppv-2017
lopez-escamez-2015
kattah-2009

Frequently asked questions

What is the difference between dizziness and vertigo?: Dizziness is a broad term for sensations of unsteadiness, lightheadedness, or disorientation, whereas vertigo specifically refers to an illusion of movement, typically spinning. Vertigo more often points to the vestibular system, though careful evaluation is needed because causes range widely.
What is the most common cause of vertigo from the inner ear?: Benign paroxysmal positional vertigo, in which displaced inner-ear crystals provoke brief episodes of vertigo with changes in head position, is the most common inner-ear cause of vertigo. This entry describes the condition in general reference terms and is not individual medical advice.