A number of conditions can result in Bell's palsy (facial nerve mononeuropathy).
Conditions associated with Bell's palsy include:
(1) viral infection, including HIV, EBV, HSV and Herpes zoster
(2) Lyme disease
(3) Guillain-Barre syndrome
(4) otitis media
(5) syphilis
(6) stroke
(7) multiple sclerosis
(8) sarcoidosis
(9) tumor
(10) trauma to the facial nerve
(11) Melkersson-Rosenthal syndrome
(12) Moebius syndrome
(13) stroke
(14) ischemia (preeclampsia, hypertension, diabetes, etc)
Many cases are considered idiopathic, presumably post-viral.
