The incidence of Bell's palsy is significantly higher during the last
trimester of pregnancy and the puerperium. Suggested explanations for
this association include fluid retention, hypertension, compromise of
the vasa nervorum, infection (particularly with herpes simplex virus),
and an autoimmune process. The diagnosis is confirmed by identifying
lower motor neurone paralysis and excluding secondary causes for the s
ymptom complex. The majority of cases resolve spontaneously. Recovery
may be delayed or incomplete in older patients and those with recurren
t episodes or severe initial symptoms. The role of diuretics, steroids
, or surgical decompression in treatment of pregnancy-related cases of
Bell's palsy has not been well studied.