Bell’s palsy

Sudden weakness in the muscles on one half of the face.
Bell's palsy may be a reaction to a viral infection. It rarely occurs more than once.
Rare
Fewer than 200,000 US cases per year
Treatable by a medical professional
Requires a medical diagnosis
Lab tests or imaging often required
Short-term: resolves within days to weeks
Critical: needs emergency care
Category:Nervous system
Category:Deadly
Category:Critical