Dizziness: Causes, Types, and Treatment Methods

What Is Dizziness?

Hello, I am Dr. Emre Gecer. "I feel dizzy" is a broad complaint that patients use to describe very different experiences. In a medical approach, correctly classifying dizziness is the first step toward an accurate diagnosis and treatment. Dizziness is evaluated in four main categories:

1. Vertigo

Vertigo is the illusion that you or your surroundings are rotating or moving. It is the perception of motion in the absence of real movement. It is described as "the room is spinning around me" or "I am spinning." It usually points to a pathology in the vestibular system and is the most specific form of dizziness complaint.

2. Presyncope

A feeling of nearly fainting or of the eyes going dark. It usually results from inadequate blood flow to the brain (cerebral hypoperfusion). Orthostatic hypotension, vasovagal reaction, cardiac arrhythmias, and aortic stenosis are the most common causes. Worsening upon standing is typical.

3. Disequilibrium

A sense of imbalance when walking or standing, accompanied by fear of falling. There is no rotational sensation in the head. The most common causes are peripheral neuropathy, cerebellar disorders, Parkinson's disease, and multiple sensory deficit syndrome (in the elderly).

4. Lightheadedness

A hard-to-describe sense of head lightness or "emptying of the head." This nonspecific symptom may be associated with anxiety, hyperventilation, depression, medication side effects, and chronic illness.

Physiology of the Vestibular System

Our sense of balance is provided by the integration of three sensory systems:

• Vestibular system (inner ear): The three semicircular canals in each inner ear sense angular (rotational) movements, while the utricle and saccule sense linear movements and gravity. The semicircular canals are filled with endolymph; during head movement, endolymph flow deforms the cupula and stimulates hair cells to generate signals.
• Visual system: Information from the eyes contributes to perception of position and movement
• Proprioceptive system: Positional information from muscles, tendons, and joints

Information from these three systems is integrated in the vestibular nuclei of the brainstem and in the cerebellum. A disturbance in any system, or a mismatch between systems, causes a sensation of dizziness.

Causes of Peripheral Vertigo

Peripheral vertigo is a form of vertigo originating from the inner ear or the vestibular nerve. It accounts for more than 80% of all vertigo cases and is generally not as dangerous as central vertigo.

1. Benign Paroxysmal Positional Vertigo (BPPV)

BPPV is the most common cause of vertigo and accounts for approximately 20-30% of all vertigo cases. It develops when calcium carbonate crystals (otoconia/otoliths) detach from the utricle and migrate into the semicircular canals (most often the posterior canal). During head movements these crystals create abnormal flow in the endolymph and falsely stimulate the cupula.

Characteristic features of BPPV:

• Short-lived vertigo attacks (usually 10-60 seconds) triggered by changes in head position
• Provoked by rolling over in bed, tilting the head back (reaching for a shelf, lying down in a dental chair)
• Nausea may accompany, but there is no hearing loss or tinnitus
• Between attacks the patient is completely normal

2. Ménière's Disease

Ménière's disease is a chronic disorder characterized by endolymphatic hydrops (excessive accumulation of endolymph) in the inner ear. Its classic tetrad:

• Episodic vertigo: Spontaneous vertigo attacks lasting from 20 minutes to several hours
• Fluctuating sensorineural hearing loss: Initial loss at low frequencies that spreads to all frequencies over time
• Tinnitus: Ringing or buzzing in the affected ear
• Aural fullness: Feeling of pressure or fullness in the affected ear

The disease is usually unilateral, but bilateral involvement may develop over time in 30-50% of patients.

3. Vestibular Neuritis

Develops from inflammation (usually viral) of the vestibular nerve. It is characterized by sudden-onset, severe, continuous vertigo. Nausea, vomiting, and imbalance are prominent. Vertigo usually peaks within 24-48 hours and gradually improves over days to weeks. Hearing is unaffected — this feature distinguishes vestibular neuritis from labyrinthitis.

4. Labyrinthitis

Inflammation of both the vestibular and cochlear parts of the inner ear. In addition to severe vertigo similar to vestibular neuritis, it is accompanied by hearing loss and tinnitus. It may be viral or bacterial (especially as a complication of otitis media).

Causes of Central Vertigo

Central vertigo originates from the brainstem or cerebellum. Although less common than peripheral vertigo, it can potentially be much more dangerous:

• Cerebellar or brainstem stroke: Posterior circulation strokes may present with isolated vertigo — lateralizing findings, ataxia, dysarthria, and diplopia may accompany. Cerebellar infarction or hemorrhage requires urgent neurologic evaluation.
• Multiple sclerosis (MS): In young adults, demyelinating plaques affecting brainstem vestibular pathways can cause vertigo and nystagmus. Internuclear ophthalmoplegia is a characteristic MS finding.
• Vestibular schwannoma (acoustic neuroma): A slow-growing benign tumor of the 8th cranial nerve — asymmetric sensorineural hearing loss, tinnitus, and imbalance. Acute vertigo is rare.
• Vestibular migraine: Episodic vertigo associated with migraine headache — 25-35% of migraine patients experience vestibular symptoms. Vertigo attacks may occur simultaneously with the headache or independently.

HINTS Examination: Peripheral or Central?

In acute continuous vertigo, the HINTS examination (Head Impulse, Nystagmus, Test of Skew) is a powerful clinical tool used in emergency departments to distinguish peripheral from central causes:

• Head Impulse Test: With the patient's eyes fixed on a stationary point, the head is rapidly turned to one side. In a peripheral lesion the eyes drift with the head and a corrective saccade is seen (positive test). In a central lesion the test is usually normal (negative test — a dangerous finding!).
• Nystagmus Assessment: In peripheral vertigo, nystagmus is unidirectional, horizontal or horizontal-rotatory, and beats away from the side of the lesion. In central vertigo, nystagmus may change direction, be purely vertical, or purely torsional.
• Test of Skew (Vertical Deviation Test): Vertical eye misalignment is sought using the alternating cover test. A positive test (skew deviation) strongly suggests a central lesion.

If any central finding (normal head impulse, direction-changing nystagmus, or positive skew) is present on the HINTS examination, MRI evaluation of the posterior fossa should be performed. Studies have shown that the HINTS examination is even more sensitive than MRI in the early period.

Dix-Hallpike Maneuver: BPPV Diagnosis

The provocative test used to diagnose BPPV:

• With the patient seated, the head is turned 45 degrees toward the suspected side
• The patient is rapidly laid back into the supine position with the head hanging below the edge of the bed
• The eyes are observed — after a latent period of 1-5 seconds, a geotropic (toward the ground), rotatory, short-lived (<60 seconds), fatigable nystagmus supports the diagnosis of BPPV
• The test is performed separately for each side

Epley Maneuver: BPPV Treatment

For posterior canal BPPV, the Epley maneuver (canalith repositioning maneuver) is the gold standard treatment. The success rate is 70-90% in a single session and reaches 95% with multiple applications:

• Step 1: With the patient seated, the head is turned 45 degrees toward the affected side
• Step 2: The patient is rapidly laid back into the supine position (Dix-Hallpike position) and held there for 30 seconds
• Step 3: The head is rotated 90 degrees to the opposite side (now looking 45 degrees toward the other side), held for 30 seconds
• Step 4: The patient rolls onto the same side with the body (close to face-down), held for 30 seconds
• Step 5: The patient is slowly brought back to a seated position

The Epley maneuver redirects displaced otoliths from the posterior canal back into the utricle. Brief vertigo and nausea may occur during the maneuver; this is an expected reaction.

Drug Treatment

The main medications used in vertigo treatment:

• Meclizine (Antivert): An H1 antihistamine — provides vestibular suppression. Reduces nausea and dizziness during acute vertigo attacks. May cause sedation. Because the Epley maneuver is first line for BPPV, drug treatment should only be used as symptomatic support.
• Betahistine (Betaserc): A histamine H3 receptor antagonist and H1 agonist — increases inner ear microcirculation. Used prophylactically in Ménière's disease to reduce the frequency and severity of attacks. Given at 16-24 mg three times a day.
• Dimenhydrinate (Dramamine): Short-term use in acute vestibular symptoms
• Benzodiazepines (diazepam): Vestibular suppression in severe acute vertigo — should be used short term; chronic use should be avoided because of dependence risk
• Ondansetron: As an antiemetic when severe nausea and vomiting accompany
• Corticosteroids: Early methylprednisolone in vestibular neuritis may accelerate recovery of vestibular function

Important warning: Vestibular-suppressant medications (meclizine, dimenhydrinate, benzodiazepines) provide symptomatic relief in the acute period but must not be used for more than 48 hours. Prolonged use can delay vestibular compensation (the brain's adaptation process) and impede recovery.

Vestibular Rehabilitation

Vestibular rehabilitation is an evidence-based treatment approach for chronic imbalance and recurrent vertigo attacks. This program, delivered with a physiotherapist, includes:

• Habituation exercises: Repetition of vertigo-provoking movements desensitizes the brain
• Gaze stabilization exercises: Improve image stability during head movements (improving the vestibulo-ocular reflex)
• Balance training: Static and dynamic balance exercises — on different surfaces, with eyes open and closed

Red Flags: Situations Requiring Urgent Evaluation

Go to the emergency department immediately if the following symptoms are present — a central (brain-related) cause may be at play:

• Sudden-onset severe vertigo + neurologic findings: Speech disorder (dysarthria), difficulty swallowing (dysphagia), double vision (diplopia), facial numbness or weakness, weakness in an arm or leg
• Cerebellar findings: Ataxia (coordination disorder), dysmetria (deviation on finger-to-nose test), wide-based gait
• Severe headache together with vertigo: Especially "the worst headache of my life" — cerebellar hemorrhage or subarachnoid hemorrhage
• Altered consciousness
• New-onset severe hearing loss with vertigo: Labyrinthitis or a central pathology
• Acute vertigo in a patient with cardiovascular risk factors: Hypertension, diabetes, atrial fibrillation, smoking — risk of posterior circulation stroke
• Pure vertical or pure torsional nystagmus: Indicator of a central lesion

Conclusion

Dizziness is an extremely common complaint in the community; most cases are of peripheral vestibular origin and have a good prognosis. BPPV, the most common cause of vertigo, can be treated effectively with a simple clinical maneuver (Epley). However, it is important to remember that dizziness is not always innocent; acute-onset vertigo together with neurologic findings may indicate a life-threatening condition such as cerebellar or brainstem stroke. Correct classification, careful examination, and clinical tools such as HINTS are vital for distinguishing dangerous causes.

Wishing you healthy days.
Dr. Emre Gecer

References

• Adams and Victor's Principles of Neurology, 12th Edition — Chapter: Dizziness and Vertigo
• Harrison's Principles of Internal Medicine, 22nd Edition — Chapter: Dizziness and Vertigo
• Bradley and Daroff's Neurology in Clinical Practice, 8th Edition — Chapter: Neuro-otology