Dizziness and Peripheral Neuropathy: Sorting Vertigo From Presyncope and the Neuropathy Work-Up

Dizziness is sorted by timing and triggers, not by the word the patient uses. Brief episodes triggered by head position point to benign paroxysmal positional vertigo (BPPV); an acute, continuous vertigo lasting days needs the HINTS examination to separate vestibular neuritis from a posterior circulation stroke; and lightheadedness on standing points to orthostatic or cardiac presyncope. Peripheral neuropathy is a separate but linked problem: distal symmetric polyneuropathy is worked up with glucose testing, vitamin B12 with methylmalonic acid and serum protein immunofixation, and every patient with diabetes needs annual monofilament testing and a foot examination.

The two topics share a page because they share a patient: an older adult with diabetes whose numb feet, orthostatic blood pressure drop and medication list all contribute to unsteadiness and falls.

Dizziness: why the description fails

Patients use "dizzy" for spinning, lightheadedness, imbalance and vague fogginess, and they change words between questions. Research behind the timing-and-triggers approach shows that the quality of the description is unreliable, while the time course and what provokes symptoms are not. Ask three questions: is it episodic or continuous, what triggers it, and how long does each episode last?

BPPV: the most common vertigo in primary care

BPPV produces brief spinning, usually under a minute, triggered by a change in head position. The 2017 American Academy of Otolaryngology Head and Neck Surgery (AAO-HNS) guideline sets the diagnostic and treatment steps.

• Diagnosis of posterior canal BPPV: the Dix-Hallpike maneuver reproduces vertigo with a torsional, upbeating nystagmus toward the lower ear after a short latency, lasting under a minute and fatiguing with repetition.
• Lateral canal BPPV: if the Dix-Hallpike is negative or shows horizontal nystagmus, perform the supine roll test.
• Treatment: a canalith repositioning procedure (the Epley maneuver for posterior canal BPPV). Postprocedural activity restrictions are not recommended.
• What not to do: no routine vestibular suppressants such as meclizine or benzodiazepines, and no imaging or vestibular testing when the patient meets BPPV criteria without other neurologic signs.
• Follow-up: reassess within one month; refer for vestibular rehabilitation or to a specialist if symptoms persist or the Dix-Hallpike becomes unrepeatable in a patient who is not improving.
• Fall risk: older adults with BPPV fall more often; ask about home safety and supervision.

Acute vestibular syndrome and the HINTS exam

A patient with continuous vertigo for hours to days, nausea, nystagmus and difficulty walking has an acute vestibular syndrome. Most cases are vestibular neuritis, but a meaningful minority are cerebellar or brainstem strokes, and many of those strokes have no limb weakness or speech change.

The HINTS examination (Kattah and colleagues, Stroke 2009) has three parts. In that study, any central finding was 100 percent sensitive and 96 percent specific for stroke, outperforming early diffusion-weighted MRI, which missed a meaningful share of strokes in the first 48 hours. The examiners were highly experienced, so sensitivity in general practice is likely lower.

The mnemonic INFARCT summarizes the dangerous pattern: Impulse Normal, Fast-phase Alternating, Refixation on Cover Test. HINTS Plus adds new hearing loss as a fourth item, since an acute vestibular syndrome with new unilateral hearing loss can signal an anterior inferior cerebellar artery stroke (Newman-Toker, 2013).

Rules that matter on the exam:

• HINTS applies only to a patient with continuous vertigo and nystagmus present at the time of the examination. Using it in BPPV or in a patient who is dizzy only on standing is an error, because a normal head impulse test in a person without vestibular injury looks "central."
• A normal head impulse test in acute vestibular syndrome is the worrying result, which is the counterintuitive point candidates miss.
• Any focal neurologic deficit, inability to walk unassisted, new severe headache or neck pain (consider vertebral artery dissection), or vascular risk with a central HINTS pattern means emergency referral for stroke evaluation. A normal CT does not exclude posterior circulation stroke.
• Vestibular neuritis is managed with a short course of a vestibular suppressant for the first few days only, then early vestibular rehabilitation. Labyrinthitis adds hearing loss and needs audiometry; sudden sensorineural hearing loss is an urgent otolaryngology referral.

Episodic spontaneous vertigo: Meniere disease and vestibular migraine

Meniere disease causes spontaneous attacks lasting 20 minutes to 12 hours with fluctuating low-frequency sensorineural hearing loss, tinnitus and aural fullness in the affected ear. Confirm with audiometry and refer to otolaryngology; first-line measures include sodium restriction and attack management. Vestibular migraine produces attacks lasting minutes to days in a patient with a migraine history, often with headache, photophobia or a visual aura during some episodes, and is managed with migraine strategies. A brief spontaneous episode in an older adult with vascular risk factors may be a transient ischemic attack and should be evaluated as such.

Presyncope and orthostatic hypotension

Orthostatic hypotension, by the 2011 consensus definition, is a sustained fall in systolic blood pressure of at least 20 mm Hg or diastolic of at least 10 mm Hg within 3 minutes of standing, after the patient has been supine. Measure blood pressure and pulse supine, then at 1 and 3 minutes of standing.

• A large heart rate rise with the drop suggests volume depletion or medication effect.
• A blood pressure drop with little heart rate rise suggests autonomic failure, as in diabetic autonomic neuropathy or Parkinson disease.
• Common drug causes: alpha-blockers for prostate symptoms, diuretics, nitrates, tricyclic antidepressants, antipsychotics, and combinations of antihypertensives.

Presyncope with exertion, palpitations, a family history of sudden death, a systolic murmur suggesting aortic stenosis, or an abnormal ECG raises concern for a cardiac cause and calls for cardiology evaluation or same-day assessment depending on severity. Management of orthostatic hypotension starts with medication review and deprescribing, fluid and salt intake if not contraindicated, slow position changes, and compression garments.

Peripheral neuropathy: recognize the pattern first

Distal symmetric polyneuropathy is length-dependent: numbness, tingling, burning or loss of balance that starts in the toes and rises up the legs before the hands are involved, producing a stocking-glove distribution. Examination shows reduced pinprick, temperature, vibration and proprioception distally and reduced or absent ankle reflexes. Romberg sign may be positive when large-fiber loss is significant.

Features that do not fit distal symmetric polyneuropathy and require referral to neurology and electrodiagnostic studies (EMG and nerve conduction studies):

• Asymmetric or patchy distribution, or a single nerve (mononeuropathy).
• Motor-predominant weakness, especially proximal.
• Rapid onset over days to weeks, or ascending weakness with areflexia (consider Guillain-Barre syndrome; emergency referral if breathing or swallowing is affected).
• Onset in the hands, or prominent autonomic failure early in the course.

The neuropathy work-up

The AAN practice parameter (England, 2009, reaffirmed since) identifies three highest-yield screening tests in distal symmetric polyneuropathy.

Commonly added: TSH, a comprehensive metabolic panel (renal and liver function), and CBC. History should cover alcohol use, chemotherapy (platinum agents, taxanes, vincristine), other neurotoxic drugs, HIV risk and family history of hereditary neuropathy (high arches, hammertoes). The ADA advises periodic B12 measurement for patients on long-term metformin, especially those with neuropathy. When labs and history explain the picture, electrodiagnostic testing is not always needed; atypical features make it mandatory.

Diabetic neuropathy and foot screening

The ADA Standards of Care (Section 12, 2026) govern screening:

• Screen for diabetic peripheral neuropathy at diagnosis of type 2 diabetes and 5 years after diagnosis of type 1 diabetes, then at least annually.
• The assessment includes a careful history, a small-fiber test (pinprick or temperature), a large-fiber test (vibration with a 128-Hz tuning fork), and a 10-g monofilament test annually to identify loss of protective sensation.
• Perform a comprehensive foot evaluation at least annually: skin, nails, deformity, pulses and sensation. Patients with loss of protective sensation, prior ulcer or amputation, or deformity need their feet inspected at every visit and referral to a foot care specialist for ongoing preventive care and therapeutic footwear.
• Check pedal pulses and assess for peripheral artery disease; an ankle-brachial index is indicated for claudication, absent pulses or a nonhealing wound.
• Optimizing glucose control slows neuropathy progression in type 1 diabetes and may slow it in type 2; it does not reverse established nerve loss.

Treating painful diabetic neuropathy

The 2022 AAN guideline recommends offering any of four drug classes, with similar moderate effect sizes, and choosing by comorbidity, cost and side effects. If one class fails or is not tolerated, switch to a different class. Opioids are recommended against. The guideline also directs screening for coexisting depression, anxiety and sleep disorders.

Topical capsaicin is an additional option for localized pain. For an older adult who is already dizzy, gabapentinoids and tricyclics add fall risk: start low and reassess gait at each dose change.

Follow-up and referral summary

• Emergency department: acute vestibular syndrome with a central HINTS finding, any focal deficit, inability to walk, sudden severe headache; ascending weakness with areflexia; syncope with exertion or cardiac features.
• Otolaryngology: sudden hearing loss (urgent), suspected Meniere disease, BPPV not responding to repositioning.
• Neurology: atypical neuropathy features, recurrent spontaneous vertigo without a clear cause, suspected TIA.
• Podiatry: loss of protective sensation, deformity, prior ulcer.
• Physical therapy: vestibular rehabilitation for neuritis or persistent imbalance, gait and balance training for neuropathy.

Patient and caregiver education

Patients with BPPV should know that it often recurs and that the same maneuver works again. Patients with neuropathy, and caregivers of older adults, need daily foot inspection with a mirror or help, properly fitting shoes, no walking barefoot, checking bath water with a hand or thermometer, and prompt reporting of any blister or color change. Teach slow position changes for orthostatic symptoms, adequate lighting at night, removal of trip hazards and use of assistive devices. Every dizzy patient should know the stroke warning signs that mean calling emergency services: sudden weakness, facial droop, speech change, double vision, inability to walk, or a severe new headache.

How the exam tests this

• Using HINTS in the wrong patient. It is only for continuous vertigo with ongoing nystagmus, not for BPPV or presyncope.
• Reading a normal head impulse as reassuring. In acute vestibular syndrome it suggests a central cause.
• Meclizine as treatment for BPPV. The answer is the Epley maneuver.
• Imaging classic BPPV. Not indicated.
• Trusting a normal head CT in acute vertigo. CT misses posterior circulation strokes.
• Checking B12 alone. The higher-yield test includes methylmalonic acid, and metformin use is the clue.
• Opioids for painful diabetic neuropathy. Recommended against.
• Monofilament only. The annual screen also includes pinprick or temperature and vibration with a 128-Hz tuning fork.
• Missing orthostatic hypotension from tamsulosin or a new antihypertensive in an older adult.

Practice question

A 67-year-old man presents with 18 hours of constant spinning, nausea and difficulty walking. He has hypertension and type 2 diabetes. He has no headache, weakness, numbness, speech change or hearing loss. He can stand but sways when walking. He has horizontal nystagmus beating to the right on right gaze and to the left on left gaze. The horizontal head impulse test shows no corrective saccade in either direction. Which of the following is the most appropriate next step?

• A. Perform the Dix-Hallpike maneuver and, if positive, an Epley maneuver
• B. Prescribe meclizine and arrange vestibular rehabilitation for vestibular neuritis
• C. Send him to the emergency department for evaluation of posterior circulation stroke
• D. Order a noncontrast head CT in the clinic and discharge him if it is normal

Answer: C. He has an acute vestibular syndrome with two central HINTS findings, direction-changing nystagmus and a normal head impulse test, plus vascular risk factors, which together point to a cerebellar or brainstem stroke even without limb weakness. Option A is wrong because the Dix-Hallpike tests for BPPV, which causes brief positional episodes rather than continuous vertigo. Option B treats the HINTS results as peripheral, but vestibular neuritis produces an abnormal head impulse test and unidirectional nystagmus. Option D is unsafe because CT is insensitive for posterior circulation stroke and a normal result does not allow discharge.

Key points

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