I want you to create a list of all possible physiological diagnoses that could

Guideline-aligned answer with reasoning, red flags and references. Clinically reviewed by Dr Kola Tytler MBBS CertHE MBA MRCGP.

Posted: 9 June 2026Updated: 9 June 2026 Guideline-Aligned (High Confidence) Clinically Reviewed
Dr Kola Tytler MBBS CertHE MBA MRCGPClinical Lead • iatroX

Possible Physiological Diagnoses Explaining the Patient’s Symptom Triad (Dizziness, Nausea, Eructations) in Chronological Order:

  • Acute Vestibular Syndrome (Episode 1): Acute left-sided rotatory vertigo with positional exacerbation and intact neurological exam suggests a peripheral vestibular disorder such as recurrent vertigo of childhood (RVC) or benign paroxysmal vertigo of childhood, now classified under pediatric episodic vestibular syndrome (pEVS) . The absence of nystagmus but symptom provocation with Dix-Hallpike is consistent with a peripheral vestibular phenotype .
  • Mesenteric Lymphadenitis-Associated Gastrointestinal Symptoms (Episode 2): Severe abdominal pain and ultrasound-diagnosed mesenteric lymphadenitis alongside dizziness and fatigue may reflect a multisystem inflammatory or infectious process causing autonomic disturbance and vestibular symptoms . Although gastrointestinal, this systemic response could produce associated vestibulo-autonomic features.
  • Vestibular Episode Responsive to High-Dose Corticosteroids (Episode 3): Three weeks of continuous dizziness evolving from rotatory to non-spinning vertigo with simultaneous lymphadenopathy and partial steroid responsiveness suggest an inflammatory or immune-mediated vestibular process, possibly vestibular migraine of childhood or an autoimmune inner ear involvement within pEVS phenotypes .
  • Persistent Postural-Perceptual Dizziness (PPPD) with Complex Multisystem Features (Current Episode and Beyond): The chronic, non-spinning dizziness, constant nausea, and repetitive eructations tightly linked to upright posture and passive motion implicate PPPD, a chronic functional vestibular disorder characterized by persistent symptoms worsened by upright posture and motion . The presence of vestibular hypofunction (26% left-sided caloric weakness) supports underlying peripheral vestibular impairment contributing to PPPD symptom persistence .
  • Autonomic Dysfunction and Orthostatic Intolerance: The reproducible symptom exacerbation by verticality, passive motion, and physical effort with associated tachycardia and subjective low blood pressure sensation suggest a physiological basis of orthostatic intolerance syndromes including postural orthostatic tachycardia syndrome (POTS), known to present with dizziness, nausea, and autonomic gastrointestinal symptoms .
  • Functional Gastrointestinal Dysmotility or Aerophagia: The severe, frequent eructations triggered by oral activity and posture with objective evidence of gastric air accumulation may indicate functional gastrointestinal dysmotility or supragastric belching disorders, potentially related to autonomic dysfunction and vestibular-autonomic cross-talk mechanisms .
  • Central Nervous System Involvement: The left hippocampal enlargement and signal alteration observed on serial MRI raise possibility of subtle limbic or central autonomic network involvement that could underlie complex vestibulo-autonomic symptomatology . Although the radiological significance is uncertain, this could represent mild edema or functional abnormality contributing to symptom genesis.
  • Excluded Diagnoses: Extensive negative CSF autoimmune and infectious panels, absence of inflammatory markers, and normal neurophysiology excluding encephalitis lessen likelihood of primary central neuroinflammatory or infectious causes .

Summary: In this pediatric patient with a complex, chronic vestibulo-autonomic syndrome evolving over time, physiological diagnoses that can explain at least three symptoms simultaneously and respect the chronological sequence include recurrent vertigo of childhood or vestibular migraine initially; a systemic/infectious episode with mesenteric lymphadenitis; an inflammatory or autoimmune vestibular process responsive to steroids; progression to persistent postural-perceptual dizziness superimposed on vestibular hypofunction; concurrent orthostatic intolerance (e.g., POTS) triggering vestibulo-autonomic symptoms; and functional gastrointestinal dysmotility explaining repetitive eructations. Subtle central nervous system involvement may modulate symptom expression. This multifactorial physiological framework accounts for the clinical course, findings, and trigger profile described .

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