ENT Guide to Dizziness: POTS, Migraine, or PPPD?

Dizziness is one of the most frequent complaints in ear, nose, and throat clinics. While vestibular neuritis and benign paroxysmal positional vertigo are common culprits, research indicates a substantial number of patients have dizziness unrelated to the inner ear. A study by Philip Zitser, Ilana Kolomiyets, and Maheen Imran highlights that a key non-vestibular cause is Postural Orthostatic Tachycardia Syndrome (POTS), a form of dysautonomia where the autonomic nervous system fails to regulate blood flow properly upon standing. The authors argue that accurately distinguishing POTS from similar-looking conditions like Vestibular Migraine and Persistent Postural-Perceptual Dizziness is essential for effective treatment.

### The Overlapping World of Chronic Dizziness

The clinical picture for POTS, Vestibular Migraine (VM), and Persistent Postural-Perceptual Dizziness (PPPD) can be frustratingly similar. All three can cause chronic, debilitating dizziness and imbalance. This overlap often leads to diagnostic confusion, where a patient with an autonomic disorder might be treated for a vestibular one, or vice versa, with poor results. Zitser and colleagues systematically reviewed the literature to clarify the distinct clinical characteristics and pathophysiology of each condition.

Their methodology involved analyzing current diagnostic criteria, symptom triggers, and objective assessment findings for POTS, VM, and PPPD. The goal was to develop a more precise model for evaluating chronic dizziness in an ENT setting by integrating autonomic nervous system assessment into the standard vestibular workup.

### Diagnosis by Trigger: Timing is Everything

The researchers found that the timing and triggers of symptoms offer the clearest initial clues for differentiation.

**Postural Orthostatic Tachycardia Syndrome (POTS)** is defined by an excessive heart rate increase upon standing, accompanied by dizziness, lightheadedness, and fatigue that *significantly improve when lying down*. This postural trigger is its hallmark. The dizziness is a result of poor blood circulation to the brain upon standing, not a problem with the balance organs.

**Vestibular Migraine (VM)** presents with episodes of vertigo—a spinning sensation—directly linked to migraine features. These episodes are typically triggered by sensory or environmental factors like bright lights, complex patterns, certain sounds, or stress, not specifically by standing up. A patient might experience vertigo with a headache, or with photophobia and phonophobia alone.

**Persistent Postural-Perceptual Dizziness (PPPD)** manifests as a chronic, non-spinning dizziness and unsteadiness lasting three months or more. It is consistently exacerbated by three factors: an upright posture, active or passive movement, and exposure to complex or moving visual environments like grocery store aisles or scrolling on a screen.

### A Practical Diagnostic Toolkit for ENT Clinics

Based on their review, Zitser’s team recommends specific diagnostic steps to separate these conditions. The first and most critical addition to a standard ENT evaluation is **orthostatic vital signs**. This simple, in-office test measures heart rate and blood pressure after lying flat for five minutes, then again at one and three minutes after standing. A sustained heart rate increase of at least 30 beats per minute (or 40 bpm in adolescents) is a strong indicator of POTS and points investigation toward dysautonomia.

This autonomic assessment should be paired with traditional vestibular tools. A detailed oculomotor exam, tests of gait and balance, and vestibular function assessments like the video head impulse test (vHIT) can identify or rule out peripheral vestibular deficits. For complex cases, tilt-table testing provides a gold-standard confirmation of POTS, while neuroimaging (like an MRI) helps exclude other neurological causes.

### Direct Implications for Patient Care and Treatment Pathways

The practical implications of this diagnostic model are significant. For the patient, it means moving away from a cycle of misdiagnosis and ineffective vestibular rehabilitation or medications. Identifying POTS redirects treatment toward autonomic management: increased fluid and salt intake, compression garments, specific physical therapy protocols (like the Levine or CHOP protocol), and sometimes medications to regulate blood volume and heart rate.

Correctly diagnosing VM allows for the use of migraine prophylactic medications, lifestyle modifications to avoid triggers, and strategies to manage sensory sensitivity. For PPPD, treatment focuses on specialized vestibular rehabilitation combined with cognitive-behavioral therapy and SSRIs to recalibrate the maladaptive postural and visual reflexes.

This approach also reframes how ENT specialists view chronic dizziness. It is not a puzzle with only one solution. “Both vestibular and autonomic dysfunction can lead to chronic dizziness,” the authors state. By systematically screening for autonomic issues like POTS, clinicians can ensure patients are on the correct treatment path from the outset.

This integrated model, detailed in their paper published in *Cureus* (DOI: 10.7759/cureus.108903), provides a clear, evidence-based roadmap. It emphasizes that a comprehensive evaluation of dizziness must look beyond the inner ear to include the nervous system’s automatic control center, leading to more accurate diagnoses and better patient outcomes. As research continues to explore connections between hearing health and neurological function, similar integrative approaches are being applied to conditions like tinnitus and anxiety and the use of neuromodulation therapies.