Left Bell's palsy following the first dose of mRNA-1273 SARS-CoV-2 vaccine: A case report

Clin Imaging. 2022 Feb;82:1-4. doi: 10.1016/j.clinimag.2021.10.010. Epub 2021 Nov 4.


Even though no definitive link has been established, Bell's palsy has been described as a potential side effect of SARS-CoV-2 mRNA vaccines in a few reports, and the US Food and Drug Administration has recommended strict surveillance of its occurrence in the vaccinated general population. We present the case of a previously healthy 35-year-old female patient who developed Bell's palsy 12 h after receiving the first dose of the mRNA-1273 vaccine. Her general practitioner performed the diagnosis, and corticosteroid treatment was initiated, with slow symptoms improvement. The neurologist's evaluation and a contrast-enhanced brain Magnetic Resonance Imaging revealed a subtle enhancement of the left facial nerve, confirming the diagnosis of Bell's palsy.

Keywords: Bell's palsy; COVID-19 vaccine side effects; Facial nerve paralysis; Moderna vaccine; SARS-CoV-2 vaccine.

Publication types

  • Case Reports

MeSH terms

  • 2019-nCoV Vaccine mRNA-1273
  • Adult
  • Bell Palsy* / chemically induced
  • COVID-19 Vaccines
  • COVID-19*
  • Female
  • Humans
  • SARS-CoV-2
  • mRNA Vaccines


  • COVID-19 Vaccines
  • mRNA Vaccines
  • 2019-nCoV Vaccine mRNA-1273