Vestibular Symptoms: An Underrecognized Extra-Sinonasal Dimension of Chronic Rhinosinusitis

Chronic rhinosinusitis (CRS) is a prevalent inflammatory disease traditionally defined and assessed by sinonasal symptoms such as nasal obstruction, rhinorrhea, facial pressure, and olfactory dysfunction. However, the burden of CRS extends beyond the sinonasal compartment, including a range of systemic and functional complaints that are not routinely addressed in standard rhinologic practice. Among these, vestibular symptoms, including dizziness, imbalance, and nonspecific disequilibrium, are frequently reported by patients with CRS, yet remain underrecognized and poorly integrated into current diagnostic frameworks and clinical guidelines, despite being captured as a single, psychometrically limited item within the 22-item Sinonasal Outcome Test (SNOT-22). Clinical observations and limited published data, mostly small observational studies and case reports, suggest that vestibular symptoms may fluctuate in parallel with CRS disease activity and may improve following effective medical or surgical control of sinonasal inflammation. Proposed mechanisms include Eustachian tube dysfunction, immune-mediated and neurogenic pathways, trigemino-vestibular interactions, and altered multisensory integration, although current evidence does not establish a causal relationship between CRS disease activity and measurable peripheral vestibular dysfunction. Comparative observations in allergic rhinitis and post-viral upper-airway inflammation situate CRS within a broader inflammatory upper-airway–vestibular interface. This Commentary highlights vestibular dysfunction as an underappreciated extra-sinonasal dimension of CRS with potential clinical and functional relevance. By drawing attention to this clinical blind spot, we aim to encourage more systematic symptom inquiry, interdisciplinary dialogue, and prospective research into the functional consequences of chronic upper-airway inflammation.