How are you? Bell's palsy is a disorder of the facial nerve and can lead to weakness or paralysis of these muscles. The cause of this condition is often not clear. Though it appears to be a polyneuritis with possible viral, inflammatory, autoimmune, and ischemic etiologies. Also, increasing evidence implicates herpes simplex type I and herpes zoster virus reactivation from cranial-nerve ganglia. Other conditions like HIV infection, Lyme disease, middle ear infection and sarcoidosis have also been associated(ref: http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0001777/). It may take 2-3 days for symptoms to occur but may also start suddenly. Bell palsy may recur in 4-14% of patients and
usually is associated with a family history of recurrent Bell palsy. Take care and regards.