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Taste Dysfunction and Bell's Palsy: A Scoping Review
Sherina R Thomas1, Samuel L Oyer1,2, Steven D Munger1,3
1Division of Research, Department of Otolaryngology-Head and Neck Surgery, University of Virginia School of Medicine, Charlottesville, Virginia, USA.
The Laryngoscope
|July 18, 2026
Summary
Taste dysfunction is common in Bell's palsy, affecting up to 70% of patients when tested. While often improving within six months, its long-term impact on recovery needs further study.
Area of Science:
- Neurology
- Otolaryngology
- Sensory Science
Background:
- Taste dysfunction is a recognized but inconsistently documented symptom of Bell's palsy.
- Understanding its prevalence and impact is crucial for patient management.
Purpose of the Study:
- To map the existing literature on taste dysfunction in Bell's palsy.
- To investigate the prevalence, underlying mechanisms, and prognostic value of taste dysfunction.
Main Methods:
- A scoping review of peer-reviewed studies was conducted.
- Searches included PubMed, Embase, and Web of Science databases.
- Data were synthesized descriptively following PRISMA-ScR guidelines.
Main Results:
- Nineteen studies were reviewed, showing self-reported taste dysfunction from 10% to 60%.
- Psychophysical testing indicated higher rates (>70%) of subclinical taste impairment.
- Taste dysfunction often preceded facial weakness, suggesting early nerve involvement.
Conclusions:
- Taste dysfunction is a frequent feature of Bell's palsy, more accurately detected by taste stimulus testing.
- Early assessment of taste may indicate broader facial nerve involvement.
- Standardized longitudinal studies are needed to clarify the prognostic significance of taste deficits.
