What this page helps you understand: If someone suddenly feels continuous spinning or severe dizziness, the main worry is whether this is an inner-ear attack or something dangerous like stroke. HINTS is one part of a doctor’s bedside check in that situation. It is combined with the history, eye movements, walking balance, hearing symptoms, blood pressure/sugar clues, stroke risk, and emergency warning signs.
In simple words: HINTS is useful only when vertigo is continuous for hours to days and a trained clinician can see the eye findings. It is not for checking yourself at home, and it is not the usual test for brief spinning when turning in bed.
HINTS exam in acute vertigo is a bedside eye-movement examination used by trained clinicians in a very specific situation called acute vestibular syndrome. This means sudden continuous vertigo or dizziness lasting hours to days, usually with nausea, vomiting, spontaneous nystagmus, and difficulty walking. In that setting, HINTS can help separate a likely inner-ear problem, such as vestibular neuritis, from a central cause such as posterior circulation stroke.
The biggest mistake is using HINTS for every dizzy patient. It is not for a few seconds of spinning when turning in bed, not for old dizziness that has settled, and not for self-checking at home. Used in the wrong situation, it can falsely reassure a stroke patient or falsely frighten a BPPV patient.
First, choose the right path:
- This may need HINTS: continuous acute vertigo for hours to days with nystagmus and imbalance.
- This usually needs a different test: brief positional spinning that lasts seconds, where Dix-Hallpike testing or supine roll testing is more relevant.
- Go to emergency care: vertigo with weakness, double vision, slurred speech, severe headache, fainting, chest pain, or inability to walk.
- Book a vertigo clinic review: recurrent non-emergency vertigo needing VNG testing, hearing testing, positional testing, or migraine/BP/medication review.
What HINTS means
HINTS stands for Head Impulse, Nystagmus, and Test of Skew. Many clinicians also add a bedside hearing check, called HINTS+, because new hearing loss during acute vertigo can change the urgency and the differential diagnosis.
| Part of HINTS | What the clinician checks | Why it matters |
|---|---|---|
| Head impulse | Whether the eyes stay fixed on a target during a quick small head turn | In the correct acute vestibular syndrome setting, a normal head impulse despite severe symptoms can be a central warning sign. |
| Nystagmus | The direction and behavior of involuntary eye movements | Direction-changing gaze-evoked nystagmus, vertical nystagmus, or other central patterns need urgent review. |
| Test of skew | Vertical eye misalignment on alternate cover testing | Skew deviation can suggest a brainstem or cerebellar process. |
| HINTS+ | New hearing loss along with acute continuous vertigo | Hearing change can raise concern for AICA-territory stroke or other urgent inner-ear/vascular problems. |
When the HINTS exam in acute vertigo is appropriate
HINTS is intended for patients who currently have acute vestibular syndrome. The patient is usually continuously dizzy or vertiginous, has spontaneous nystagmus, feels nauseated or vomits, and is clearly unsteady. The exam is most useful while symptoms and eye findings are present.
HINTS is usually not useful for short attacks that come only when rolling in bed or looking up. Those attacks commonly fit BPPV and need canal-specific positional tests. A patient with blackouts, palpitations, chest pain, very low blood pressure, or low sugar symptoms needs cardiovascular and emergency assessment, not only vestibular testing.
Which situation sounds like you?
- Spinning for seconds: spinning for seconds on turning in bed usually points toward BPPV testing.
- Dizziness for hours to days: continuous vertigo with nystagmus may fit acute vestibular syndrome and clinician-performed HINTS.
- Dizziness with nerve symptoms: weakness, speech change, double vision, severe headache, or inability to walk means emergency care.
- Repeated attacks: recurrent spells may need migraine, Meniere, BP, sugar, medicine, hearing, and VNG review.
Stroke warning signs during vertigo
Do not wait for a routine appointment if vertigo comes with neurological or cardiac warning signs. Emergency assessment is safer when any of these are present:
- new weakness, numbness, facial droop, slurred speech, confusion, or double vision
- new severe headache or neck pain with vertigo
- inability to walk, sit, or stand without support
- vertical nystagmus or direction-changing nystagmus seen by a clinician
- new hearing loss with severe continuous vertigo
- chest pain, fainting, palpitations, breathlessness, or collapse
HINTS signs that raise concern for central vertigo
In the correct acute vestibular syndrome setting, clinicians often remember the central warning pattern as INFARCT: Impulse Normal, Fast-phase Alternating nystagmus, and Refixation on Cover Test. In plain language, a normal head impulse despite severe continuous vertigo, direction-changing nystagmus, or skew deviation can point away from a simple inner-ear explanation and toward stroke or another central cause.
The opposite pattern can support peripheral vestibular loss, but only when the full story fits. An abnormal head impulse, unidirectional peripheral-type nystagmus, and no skew may support vestibular neuritis, yet vascular risk, hearing symptoms, gait, neurological signs, examiner skill, and timing still matter.
Why HINTS is not a self-test
Patients should not try to use HINTS at home to rule out stroke. The findings can be subtle. A small eye movement, a direction change, or a skew deviation can be missed easily. Interpretation also changes if the patient does not truly have acute vestibular syndrome.
This is why phone videos, family observation, or internet instructions cannot replace an emergency or clinician-led exam. If the symptoms are sudden, severe, continuous, or mixed with neurological signs, the safe action is emergency care.
How HINTS fits with CT and MRI
Early CT is poor at excluding many posterior circulation strokes. Early MRI with diffusion-weighted imaging is better, but very early small posterior fossa strokes can still be missed. This is why bedside examination, timing, red flags, vascular risk, hearing symptoms, gait, and repeat assessment may all matter.
HINTS should be treated as part of clinical triage, not as a replacement for emergency care or imaging when stroke remains possible. If the clinician is uncertain, escalation is safer than reassurance.
How this page fits in the vertigo hub
Helpful next pages:
- Vertigo hub – start here if you are not sure which type of dizziness you have.
- Vertigo red flag check – warning signs that need urgent care.
- VNG testing for vertigo – eye-movement and balance testing context.
- Nystagmus types – central vs peripheral eye movement patterns.
- Vestibular neuritis – common peripheral cause of continuous acute vertigo.
- Dizziness vs vertigo – useful when the symptom description is unclear.
Non-emergency next steps
If dizziness is recurrent but not an emergency, the next step is to describe the pattern clearly: spinning versus faintness, duration, triggers, hearing symptoms, headache, falls, medicine use, blood pressure or sugar issues, and whether symptoms are continuous or positional. That history decides whether the priority is positional testing, VNG, hearing tests, migraine review, medication review, cardiac/BP review, or neurology referral.
Call 7393062200 or WhatsApp Dr. Prateek Porwal for non-emergency vertigo evaluation. For active stroke-like symptoms, go to emergency care first.
FAQs
What is the HINTS exam in acute vertigo?
It is a clinician-performed bedside eye movement exam used in acute vestibular syndrome, where vertigo or dizziness is continuous for hours to days with nystagmus and imbalance.
Can I do HINTS on myself at home?
No. HINTS needs trained observation of eye movements and the correct acute vestibular syndrome context. It is not reliable as a self-test.
Does a normal CT scan rule out stroke in sudden vertigo?
No. A normal CT scan does not reliably rule out posterior circulation stroke. Emergency clinicians may still need MRI, repeat assessment, or specialist review depending on red flags and examination.
Is HINTS for BPPV?
Usually no. BPPV is usually brief positional vertigo and is checked with positional tests such as Dix-Hallpike or supine roll testing. HINTS is for continuous acute vestibular syndrome.
Which doctor should assess HINTS or acute vertigo?
HINTS should be interpreted by a trained emergency, neurology, ENT, or vestibular clinician in the correct acute vestibular syndrome setting. If stroke-like symptoms are active, emergency care comes before routine clinic review.
References
- Kattah JC, Talkad AV, Wang DZ, Hsieh YH, Newman-Toker DE. HINTS to diagnose stroke in the acute vestibular syndrome. Stroke. 2009;40(11):3504-3510. PubMed: 19762709.
- Kattah JC. Use of HINTS in the acute vestibular syndrome. An overview. Stroke and Vascular Neurology. 2018;3(4):190-196.
- Edlow JA, et al. GRACE-3: acute dizziness and vertigo in the emergency department. Academic Emergency Medicine. 2023.
This article is educational and cannot diagnose the cause of acute vertigo. Sudden severe vertigo with neurological, cardiac, fainting, or walking red flags needs emergency care.
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