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A non-cancerous tumor that grows on the vestibular nerve connecting the inner ear to the brain. An acoustic neuroma, also called a vestibular schwannoma, can cause progressive one-sided hearing loss, tinnitus, and balance disturbances.
A sudden, severe onset of dizziness or vertigo, often lasting minutes to hours. Acute dizziness requires careful evaluation to distinguish inner-ear causes (such as vestibular neuritis) from potentially serious central causes, such as stroke.
Dizziness or unsteadiness triggered or worsened by anxiety or panic. The vestibular system and the brain's emotional centers are closely linked; psychological stress can amplify balance symptoms and create a self-reinforcing cycle.
Lack of voluntary coordination of muscle movements, leading to difficulty with fine motor tasks such as writing or holding a pen, and can originate from the cerebellum, spinal cord, or peripheral nerves.
A standardized hearing test that measures how well you hear sounds at different pitches and volumes. In a vertigo workup, audiometry helps detect hearing loss patterns associated with Ménière's disease, acoustic neuroma, or labyrinthitis.
The ability to maintain the body's center of gravity over its base of support. Balance is achieved by integrating signals from three systems: the vestibular (inner ear), the visual system, and proprioception (body-position sensors in muscles and joints).
Any condition that makes a person feel unsteady, dizzy, or as though they are spinning, floating, or moving. Balance disorders can arise from problems in the inner ear, brain, eyes, muscles, or joints, and each cause requires a distinct treatment approach.
The most common cause of vertigo. BPPV occurs when calcium carbonate crystals (otoconia) become displaced from the utricle into one of the semicircular canals, triggering brief but intense spinning sensations with specific head movements such as lying down or looking up.
A chronic condition in which vestibular function is permanently and significantly reduced in both inner ears simultaneously. Patients characteristically present with oscillopsia, chronic imbalance that worsens in darkness or on uneven ground, and a wide-based, unsteady gait.
A non-medical term for cognitive difficulties, including poor concentration, mental fatigue, memory lapses, and slow thinking. Patients with chronic vestibular disorders frequently report brain fog as a debilitating associated symptom.
A home exercise program used to treat BPPV. The patient repeatedly moves from sitting to lying on alternating sides, helping to disperse displaced otoconia from the semicircular canals over several days.
A group of maneuvers, most notably the Epley maneuver, designed to move displaced otoconia out of the semicircular canals and back into the utricle, resolving BPPV symptoms. All procedures are performed by a trained clinician.
A diagnostic test that irrigates each ear canal with warm and cool water (or air) to stimulate the horizontal semicircular canal and assess vestibular function independently in each ear. Asymmetric responses indicate unilateral weakness.
Dizziness arising from abnormal sensory input from the neck's muscles and joints. It is often associated with neck injury, poor posture, or cervical spine degeneration, and typically worsens with specific neck positions.
Dizziness that persists for three months or longer. Chronic dizziness significantly affects daily functioning and quality of life and often has multifactorial causes, requiring a comprehensive vestibular and medical assessment.
The snail-shaped, fluid-filled structure in the inner ear responsible for converting sound vibrations into nerve signals sent to the brain. The cochlea works alongside vestibular structures but serves hearing rather than balance.
A sense of unsteadiness or imbalance felt primarily in the body rather than in the head. Disequilibrium is distinct from vertigo (a spinning sensation) and is often described as feeling off-balance while standing or walking.
Persistent imbalance that can follow an inner-ear infection such as labyrinthitis or vestibular neuritis. Inflammation damages vestibular hair cells, and the brain must recalibrate — a process which can take weeks to months.
An umbrella term covering several sensations: spinning (vertigo), lightheadedness, floating, unsteadiness, or a feeling of nearly fainting. Accurately describing the type of dizziness to your clinician helps identify the underlying cause.
Seeing two images of a single object (diplopia). When associated with vertigo or dizziness, double vision may indicate a central nervous system problem, such as brainstem or cerebellar involvement, and warrants urgent assessment.
Sudden falls without loss of consciousness, sometimes called a Tumarkin attack, occurring in Ménière's disease. The person drops to the ground without warning due to an abrupt loss of postural control.
The common term for the tiny calcium carbonate particles (otoconia) found in the utricle of the inner ear. When dislodged into the semicircular canals, they trigger the spinning episodes characteristic of BPPV.
The potassium-rich fluid that fills the membranous labyrinth of the inner ear. Movement of endolymph stimulates hair cells that signal head motion and sound to the brain. Excess endolymph, known as hydrops, is linked to Ménière's disease.
The gold-standard canalith repositioning procedure for posterior canal BPPV, in which a clinician guides the patient through four precise head positions to return displaced otoconia to the utricle.
Vertigo that comes and goes in discrete attacks rather than persisting continuously. Common causes include BPPV (seconds-long episodes), vestibular migraine (minutes to hours), and Ménière's disease (20 minutes to several hours).
The likelihood that a person will experience a fall due to balance impairment. Patients with vestibular disorders have significantly elevated fall risk, and formal assessment guides targeted rehabilitation to reduce it.
Worsening of vestibular symptoms when the body or brain is fatigued. A compensating vestibular system works harder to maintain balance, so tiredness removes this compensatory capacity and brings symptoms to the surface.
Dizziness driven by altered brain processing rather than structural inner-ear damage. Also called Persistent Postural-Perceptual Dizziness (PPPD), it features chronic unsteadiness that worsens in visually busy environments and with upright posture.
An abnormal or unsteady pattern of walking. Vestibular gait imbalance often involves veering to one side, wide-based stepping, or reluctance to walk in the dark, all reflecting reduced confidence in balance signals from the inner ear.
Exercises prescribed in vestibular rehabilitation that train the vestibulo-ocular reflex. Patients move their head while keeping a fixed target in focus, helping the brain recalibrate after inner-ear injury.
A colloquial term used interchangeably with lightheadedness or mild dizziness, often describing a floaty or swimmy sensation rather than true rotational vertigo. Commonly used in South Asia as an everyday descriptor of vestibular symptoms.
Mindfulness and sensory-awareness strategies used to reduce anxiety and dizziness during a vestibular episode. Examples include focusing on the sensation of feet on the floor, slow deep breathing, or engaging the five senses.
A bedside clinical test in which the examiner rapidly rotates the patient's head to one side while the patient fixes their gaze on a target. A corrective catch-up eye movement (saccade) indicates vestibular weakness on the side of the head turn.
Worsening of dizziness or nausea with any head movement. Common in active vestibular disorders and PPPD, this symptom is specifically targeted by vestibular rehabilitation exercises through gradual exposure to head movement.
Reduced ability to hear sounds. In the context of vestibular disorders, fluctuating low-frequency hearing loss is a hallmark of Ménière's disease, while progressive unilateral hearing loss may indicate acoustic neuroma.
Excess fluid pressure in the endolymphatic space of the inner ear. Endolymphatic hydrops is the underlying mechanism of Ménière's disease and can also affect the otolith organs, causing fluctuating hearing and balance symptoms.
A broad term for difficulty maintaining stable posture or gait. Imbalance in vestibular patients reflects the brain's reduced or conflicting input from the inner ear, requiring it to rely more heavily on vision and proprioception.
Also known as vestibular neuritis, this condition involves inflammation of the vestibular branch of the eighth cranial nerve, typically following a viral infection. It causes sudden, severe vertigo that gradually improves over days to weeks.
The fluid-filled cavity deep within the temporal bone that houses both the cochlea (hearing) and the vestibular labyrinth (balance). It is the primary sensory organ for detecting head movement, gravity, and sound.
A feeling of being unsteady on one's feet, as though the ground is shifting or tilting. Instability is distinct from spinning vertigo and is a frequent residual symptom after an acute vestibular event.
Dizziness caused by reduced blood flow to the brain or inner ear. Vertebrobasilar insufficiency and labyrinthine infarction are important vascular causes that must be ruled out in new-onset vertigo.
Also known as nystagmus — involuntary, rhythmic oscillations of the eyes. The direction, pattern, and context of nystagmus provide critical diagnostic information about whether a vestibular disorder is peripheral (inner ear) or central (brain).
A condition triggered by a conflict between motion signals received by the eyes, vestibular system, and body, causing nausea, sweating, pallor, and vomiting. People with pre-existing vestibular disorders are particularly susceptible.
The complex system of interconnected fluid-filled chambers and canals in the inner ear. It includes the cochlea (hearing), the semicircular canals (rotational motion), and the otolith organs — the utricle and sacculus — which detect linear motion and gravity.
Inflammation of the entire labyrinth — both the hearing and balance parts of the inner ear — typically caused by a viral infection. Unlike vestibular neuritis, labyrinthitis also causes hearing loss and tinnitus alongside severe vertigo.
A sensation of nearly fainting, floating, or feeling faint without actual loss of consciousness. It is often caused by reduced blood flow to the brain, as in orthostatic hypotension, rather than an inner-ear problem.
Inability to maintain a stable posture, leading to swaying, stumbling, or falling. Acute loss of balance following the sudden onset of vertigo may indicate a serious underlying cause, particularly if accompanied by neurological symptoms.
A chronic inner-ear disorder characterized by recurrent episodes of severe rotational vertigo lasting 20 minutes to several hours, along with fluctuating low-frequency hearing loss, tinnitus, and a sense of fullness in the affected ear.
See Vestibular migraine. Vertigo is a recognized neurological symptom of migraine that can occur before, during, or independently of headache. It is one of the most commonly underdiagnosed causes of episodic vertigo in adults.
Heightened sensitivity to movement — either one's own movement or visual motion such as scrolling screens or moving crowds. Motion sensitivity is a hallmark feature of PPPD and an early sign of uncompensated vestibular loss.
Nausea, vomiting, and malaise caused by conflicting sensory signals during travel by car, boat, or aircraft. The inner ear and eyes disagree about the body's motion, overwhelming the brain's ability to reconcile the conflict.
Dizziness arising from simultaneous deficits across multiple balance-related sensory systems. It is common in elderly patients, in whom age-related decline affects the vestibular, visual, and proprioceptive systems concurrently.
An unpleasant urge to vomit that frequently accompanies acute vertigo. It is a reflex response to conflicting vestibular signals reaching the brainstem nausea centers.
See Cervicogenic dizziness. Dizziness originating from dysfunctional proprioceptive signals sent by the cervical spine muscles and joints, rather than from the inner ear itself.
The medical subspecialty concerned with neurological disorders of the ear, particularly conditions at the interface of the vestibular system and the brain. Neuro-otologists diagnose and treat complex vertigo and hearing disorders.
Involuntary, rhythmic to-and-fro movements of the eyes. The pattern of nystagmus — including its direction, whether it changes with gaze position, and whether it is suppressed by fixation — is the most important single clinical sign for differentiating inner-ear from brain-based vertigo.
A significant drop in blood pressure upon standing, causing lightheadedness or near-fainting. It is common in dehydration, older age, and with certain medications.
The perception that stationary objects are bouncing, oscillating, or jumping during head movement. It is caused by failure of the vestibulo-ocular reflex to stabilize the retinal image during motion, and severely impairs reading and driving.
Microscopic calcium carbonate crystals — literally 'ear stones' — embedded in the gelatinous membrane of the otolith organs. When otoconia detach and migrate into the semicircular canals, they cause BPPV.
The two gravity-sensing structures in the inner ear — the utricle and saccule. They detect linear acceleration and the pull of gravity to inform the brain about head tilt and straight-line movement.
Vertigo caused by a problem in the inner ear or the vestibular nerve. Peripheral vertigo, as seen in BPPV, Ménière's disease, and vestibular neuritis, typically presents with intense spinning, nausea, and nystagmus suppressed by visual fixation.
A chronic functional vestibular disorder characterized by non-spinning dizziness, unsteadiness, and motion sensitivity lasting more than three months. It often follows an acute vestibular event and worsens with upright posture and visually complex environments.
Vertigo triggered by specific changes in head position relative to gravity, most commonly rolling over in bed, lying down, or looking upward. This is the classic presentation of BPPV.
An objective computerized test of standing balance that measures how well a patient uses vestibular, visual, and proprioceptive inputs individually and in combination, identifying which sensory system is deficient.
Age-related deterioration of balance function resulting from the cumulative decline of vestibular, visual, and proprioceptive systems. Patients present with chronic, non-specific unsteadiness and impaired gait, particularly in low-light conditions.
The sensation of nearly fainting — lightheadedness, greyness of vision, sudden weakness — without actual loss of consciousness. It is caused by transient reduced blood flow to the brain, rather than an inner-ear problem.
A key outcome measure in vestibular care. Chronic vestibular disorders profoundly affect confidence, independence, social participation, and psychological well-being. Validated questionnaires such as the Dizziness Handicap Inventory (DHI) quantify this impact.
Repeated episodes of vertigo over months or years. The pattern of recurrence — frequency, duration, triggers, and associated symptoms — is the most important diagnostic feature for distinguishing BPPV, Ménière's disease, and vestibular migraine.
Mild, persistent unsteadiness or lightheadedness that lingers after successful BPPV treatment. It typically resolves within weeks and reflects incomplete central recalibration rather than persisting canal debris.
A specialized vestibular test in which the patient sits in a motorized chair that rotates in the dark while eye movements are recorded. It assesses horizontal semicircular canal function and is particularly useful for detecting bilateral vestibular weakness.
A specialized physiotherapy program using graded exercises to promote central compensation for inner-ear damage. It includes gaze stabilization, balance retraining, and desensitization to motion.
One of the two otolith organs in the inner ear. The saccule primarily detects vertical linear acceleration and high-frequency vibration, contributing to the brain's perception of gravity and up-and-down motion.
Three fluid-filled loops in the inner ear arranged at right angles to each other — horizontal, anterior, and posterior — which detect rotational head movement in all three planes.
A conflict between signals from different balance-sensing systems — the eyes, vestibular organs, and proprioceptors. When the brain receives contradictory information about the body's position, the result is dizziness, nausea, and disorientation.
Confusion about one's position, movement, or attitude in space. It manifests as uncertainty about which way is 'up', difficulty navigating familiar environments, or consistent veering when walking.
Features of acute vertigo that raise concern for a posterior circulation stroke: sudden onset, inability to walk, double vision, facial numbness, slurred speech, new headache, or direction-changing nystagmus. These constitute medical emergencies requiring immediate care.
The perception of sound — ringing, buzzing, roaring, or hissing — in the absence of an external source. Low-pitched, fluctuating tinnitus in one ear is a key diagnostic feature of Ménière's disease.
Specific conditions, activities, or exposures that provoke or worsen vertigo episodes. Common triggers include head position changes (BPPV), high-salt diet and stress (Ménière's disease), sleep deprivation (vestibular migraine), and visually busy environments (PPPD).
Sudden, unexpected falls without loss of consciousness or preceding dizziness, occurring in advanced Ménière's disease. They represent a significant fall-risk emergency and may prompt surgical intervention.
Reduced or absent function of the vestibular apparatus on one side. The healthy side dominates, pulling the eyes and perceived world toward the intact side — the basis for spontaneous nystagmus after acute vestibular injury.
The larger of the two otolith organs in the vestibule of the inner ear. It primarily detects horizontal linear acceleration and head tilt, and is the source of the otoconia that, when displaced, causes BPPV.
An illusory sensation of self-rotation or environmental rotation. True vertigo always reflects a mismatch between actual and expected vestibular, visual, and proprioceptive signals.
A type of migraine in which vestibular symptoms — vertigo, motion sensitivity, or positional dizziness — occur with or without headache. Episodes last 5 minutes to 72 hours and vestibular migraine is one of the most common yet under-recognized causes of recurrent vertigo.
Sudden, severe vertigo caused by inflammation of the vestibular nerve, most often following a viral infection. Hearing is preserved, distinguishing it from labyrinthitis. Symptoms peak in the first 24–48 hours and gradually improve as the brain compensates.
A specialized exercise program that promotes central nervous system compensation for vestibular loss, reduces symptoms, and restores functional balance. It is the most evidence-based non-surgical treatment for chronic vestibular disorders.
A quantitative version of the head impulse test using a high-speed camera to measure vestibulo-ocular reflex gain across all six semicircular canals. vHIT can identify canal-specific hypofunction and is valuable for differentiating peripheral from central vertigo.
A comprehensive diagnostic test battery using infrared video goggles to track eye movements and measure vestibular function. VNG includes oculomotor assessment, positional testing, and caloric irrigation.
Dizziness or disorientation provoked by moving visual stimuli such as scrolling on a phone, busy wallpaper, or moving traffic. The visual system overwhelms the compromised vestibular system, causing a sensory mismatch.
Difficulty maintaining a steady, straight gait. Patients may veer, widen their stance, or slow down significantly, particularly in low-light conditions where the visual system can no longer compensate for vestibular deficits.
A patient-reported sensation of body unsteadiness, often described as feeling 'like jelly' in the legs or 'like walking on a boat'. Wobbliness is a common residual symptom of vestibular disorders and a key target of balance rehabilitation.
Plain X-rays of the cervical spine are sometimes used to assess bony abnormalities contributing to cervicogenic dizziness. However, CT or MRI is preferred for evaluating the inner ear, brainstem, and cerebellum in most vestibular presentations.
The most common question asked by patients with vestibular disorder. Dizziness can arise from the inner ear, brain, cardiovascular system, or psychological factors. A structured history, clinical examination, and targeted vestibular tests are needed to pinpoint the cause.
The functional range within which a person can safely move without losing balance. Vestibular rehabilitation progressively expands a patient's zone of stability through graded challenges, building the confidence and physical capacity needed to return to daily activities.
