Dizziness is the third most common reason Americans visit their family doctor, accounting for approximately 8 million office visits per year. The word "dizzy" is used to describe a spectrum of sensations — the spinning or moving sensation of vertigo, the feeling of lightheadedness or faintness (presyncope), or a vague sense of unsteadiness — and each points to a different set of underlying causes requiring different treatments.
Types of Dizziness
Vertigo
A false sense of motion — typically spinning — either of yourself or your surroundings. True vertigo nearly always originates in the inner ear (peripheral vertigo) or the brainstem and cerebellum (central vertigo). The distinction is clinically critical because central vertigo can signal a stroke or brain tumour.
Presyncope (Lightheadedness)
A feeling of impending faint, often with darkening vision and weakness, typically caused by reduced blood flow to the brain. It is not a sensation of spinning.
Disequilibrium
A sense of imbalance or unsteadiness without room-spinning, typically felt in the body rather than the head. More common in older adults with peripheral neuropathy, vision problems, or musculoskeletal issues.
Benign Paroxysmal Positional Vertigo (BPPV)
BPPV is the most common cause of vertigo, accounting for approximately 20% of all dizziness presentations. It occurs when calcium carbonate crystals (otoliths) that normally sit in the utricle of the inner ear dislodge and migrate into one of the semicircular canals, where they inappropriately stimulate motion-sensing hair cells with head position changes. Episodes of intense spinning triggered by rolling over in bed, looking up, or bending forward — lasting 10–60 seconds — are classic. The Dix-Hallpike test diagnoses BPPV; the Epley repositioning manoeuvre resolves it in 80% of patients in a single office visit.
Vestibular Neuritis and Labyrinthitis
Viral infection of the vestibular nerve (neuritis) or the entire inner ear (labyrinthitis) produces acute, severe continuous vertigo lasting days, often with nausea, vomiting, and difficulty walking. Labyrinthitis additionally causes hearing loss and tinnitus. Most patients recover fully within weeks; vestibular rehabilitation exercises accelerate recovery.
Ménière's Disease
A disorder of endolymphatic fluid pressure in the inner ear causing episodic vertigo lasting 20 minutes to several hours, fluctuating low-frequency hearing loss, tinnitus (ringing), and a sense of ear fullness. Episodes are unpredictable and disabling. Management includes a low-sodium diet, diuretics, intratympanic corticosteroid injections, and — for refractory disease — intratympanic gentamicin or surgical decompression.
When Dizziness Is a Medical Emergency
Call 911 immediately if dizziness is accompanied by any of the following ("HINTS" exam red flags): sudden severe headache, double vision, difficulty speaking or swallowing, facial numbness or weakness, one-sided arm or leg weakness, or inability to walk. These suggest a posterior circulation stroke, which can mimic peripheral vertigo but is life-threatening and requires emergency intervention within hours.
Other Common Causes
- Orthostatic hypotension: Blood pressure drop on standing causes lightheadedness; common in older adults, with dehydration, and as a medication side effect.
- Medication side effects: Antihypertensives, sedatives, antidepressants, and antiepileptics are common culprits.
- Anaemia: Reduced oxygen-carrying capacity produces lightheadedness, particularly with exertion.
- Anxiety disorders: Panic attacks and anxiety commonly produce dizziness through hyperventilation and altered cerebrovascular CO₂ levels.
Sources
- Newman-Toker DE, et al. Dizziness Presentations in US EDs. Acad Emerg Med. 2008.
- Bhattacharyya N, et al. BPPV Clinical Practice Guideline. Otolaryngol Head Neck Surg. 2017.
- Mayo Clinic. Dizziness — Causes. 2023.