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Dizziness: Types, Causes and How Doctors Diagnose It

Dizziness is a vague term that patients use to describe vertigo, faintness, or unsteadiness. Clarifying the type narrows the cause dramatically.

Written by Suman Konda, PharmD, Clinical Pharmacist · Editorial policy · Not medical advice

Last updated: · How we check our content

Types
Vertigo / presyncope / disequilibrium
Commonest cause
BPPV (benign positional vertigo)
Age group
Increases with age
Cardiac cause
Must always be excluded

Three Types of Dizziness

TypeFeelCommon Causes
VertigoSpinning sensation (you or world)BPPV, vestibular neuritis, Ménière's, labyrinthitis
Presyncope / lightheadednessAbout to faint, grey-outLow BP, dehydration, vasovagal, cardiac arrhythmia
Disequilibrium / imbalanceUnsteadiness, off-balancePeripheral neuropathy, cerebellar disease, Parkinson's
Seek Urgent HelpDizziness with sudden severe headache, double vision, slurred speech, arm/leg weakness, or facial drooping: these suggest stroke. Call 999/911 immediately.

BPPV: The Most Common Cause

What Is BPPV?

Benign paroxysmal positional vertigo: tiny calcium crystals (otoliths) dislodge in the inner ear. Causes brief (seconds–minutes) spinning triggered by head movements (rolling over in bed, looking up). Highly responsive to the Epley manoeuvre.

Epley ManoeuvreA series of head-position changes done by a physiotherapist or GP that repositions the crystals. Success rate >80 % in a single session. Ask your GP for a referral.
What is the Epley manoeuvre?
A set of guided head movements that shift displaced inner-ear crystals back to their correct position. It resolves BPPV in 80–90 % of cases.
Can dehydration cause dizziness?
Yes. Low fluid intake drops blood volume and blood pressure, causing lightheadedness especially on standing (orthostatic hypotension). Increasing fluid intake usually resolves it.
When is dizziness dangerous?
New dizziness with neurological symptoms (weakness, speech problems, double vision, severe headache) is a stroke emergency. Also concerning: dizziness with chest pain, loss of consciousness, or irregular heartbeat.
Does blood pressure medication cause dizziness?
Yes. Antihypertensives, diuretics, and alpha-blockers can cause orthostatic hypotension, especially when rising quickly. Talk to your GP about dose timing or adjustment.

Related reading

Medical Disclaimer: This page is for general education only and does not replace professional medical advice. Always consult a qualified healthcare provider.

Getting the description right is most of the diagnosis

Dizziness is one of those complaints where the words matter more than any test. A spinning sensation, where the room appears to move, is vertigo and points to the inner ear or, less often, the brainstem. A sense of impending faint, greying vision and clamminess is presyncope and points to blood pressure, heart rhythm or volume. Unsteadiness only on standing and walking, with no spinning, points towards balance and proprioception, common with age, neuropathy or medication. Vague lightheadedness without any of these features is the least specific and is frequently related to anxiety, hyperventilation or medication.

Medication is one of the commonest reversible causes

  • Blood pressure medicines, especially after a dose increase or in hot weather when fluid loss is higher.
  • Diuretics, which can cause both volume depletion and low sodium or potassium.
  • Alpha blockers such as tamsulosin, a well-known cause of postural drops.
  • Sedatives, opioids and some antidepressants, particularly in older adults and in combination.
  • Gentamicin and related antibiotics, which can damage the balance organ directly.

Warning features that point away from the inner ear

Most vertigo is peripheral and benign, but a few features suggest a central cause needing urgent imaging: new severe headache or neck pain, double vision, slurred speech, facial or limb weakness or numbness, difficulty swallowing, or an inability to walk unaided even when sitting still feels tolerable. Vertigo that begins suddenly in someone with vascular risk factors, or that is accompanied by any new neurological sign, should be assessed the same day rather than treated as an ear problem.

Practical measures while the cause is sorted out

If symptoms are postural, rising in stages rather than all at once, sitting on the edge of the bed before standing, and maintaining fluid and salt intake where that is appropriate all help. Compression stockings assist some people. For confirmed benign positional vertigo, repositioning manoeuvres performed by a trained clinician are considerably more effective than medication, and vestibular sedatives such as prochlorperazine are best used briefly, as prolonged use delays the natural compensation that resolves symptoms.