![]() Left-sided paralysis was more common than right-sided paralysis. Pfizer and Moderna vaccines were the most common vaccines among articles that reported the cases of Bell’s palsy. After omitting duplicated citations and assessing the title, abstract, and full text 15 case-report and two case-series studies were included for the critical appraisal process and were included in this study. Results: During the electronic search, hand search, and reference check, we identified 1281 citations, and in hand searching, we detected additional 15 studies. The JBI critical appraisal tools for case reports or case series were used to assess the risk of bias in the included studies. ![]() Finally, the reference lists of all identified reports and articles were searched for additional studies. The search strategy aimed to find both published and unpublished studies in August 2021 and updated by hand searching in May 2022 using the identified keywords and index terms in Cochrane Library, MEDLINE (PubMed), Web of Science, Scopus, ProQuest, and Google scholar. The exclusion criteria were repeated cases and missing clinical information. The inclusion criteria for the included published studies were patient age ≥18 years, history of Bell's palsy after COVID-19 vaccination and established diagnosis in the patients with COVID-19 vaccination. Methods: This systematic review is conducted based on the Cochrane Collaboration Handbook and PRISMA Statement (Preferred Reporting Items for Systematic Reviews and Meta-Analyzes) and using the Joanna Briggs Institute (JBI) methodology for systematic reviews. This study aimed to systematically review the reported cases of Bell's palsy following vaccination against COVID-19. Given the importance of neurological manifestations, the necessity to highlight and scrutinize the incidence of them following COVID-19 vaccination is needed. Background: Bell's palsy is a rare adverse event reported in COVID-19 vaccines.
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