Framework
The four kinds of dizziness
A patient says “I'm dizzy.” The clinician's job is to find out which of four very different experiences they mean — because each points to a different mechanism and work-up.
An illusion of motion — typically rotation — of the body or environment, from asymmetric or mismatched vestibular input. Often with nausea, vomiting, and oscillopsia.
Drachman & Hart's classification
Back in 1972, two doctors (Drachman and Hart) sorted “dizziness” into four buckets based on what patients actually describe: the room spinning (vertigo), feeling about to faint (presyncope), feeling unsteady on the feet (disequilibrium), and a vague woozy or floating feeling (nonspecific dizziness).
This simple sorting is still used every day, because each bucket leads you toward different causes and different tests.
Drachman & Hart categorised dizziness into vertigo, presyncope, disequilibrium, and nonspecific dizziness — a framework that remains foundational.1 It aids in distinguishing vestibular from non-vestibular causes and selecting targeted tests, even though overlap occurs in complex cases.
A caution from the evidence: clinicians who rely on symptom qualityalone often misclassify, because patients describe the same sensation in different words and vice versa.2 Open-ended questioning, then targeted clarification, out-performs leading questions.3
Treat the four-way scheme as a starting hypothesis, not a verdict. Its value is to anchor the differential: vertigo → vestibular axis; presyncope → cardiovascular/autonomic; disequilibrium → multisensory and cerebellar; nonspecific → psychiatric, metabolic, or functional. Placed against the patient's comorbidities and associated signs, the category drives which investigations are high-yield and which are wasteful.4
Two modern entities sit awkwardly inside the scheme and are covered separately: mal de débarquement and PPPD. Their pathophysiology and treatment justify their own place “beyond the classics”.
The four, at a glance
- Vertigo — an illusion of motion; vestibular (peripheral or central).
- Presyncope — impending faint; cerebral hypoperfusion (cardiovascular/autonomic).
- Disequilibrium — unsteadiness without motion illusion; multisensory/cerebellar.
- Nonspecific — vague fog/floating; often psychiatric, metabolic, or functional.
Triage in practice
Put the framework to work: classify the sensation, then run the category's red-flag check to separate the benign from the dangerous.
The patient says “I'm dizzy.” Which do they describe?