Bell's palsy has been linked to stress, although a precise cause has not been found. Conditions such as hypertension (high blood pressure), diabetes, Lyme disease and autoimmune disorders, chronic ear infections, tumors and trauma to the head or face have also been identified as coinciding with the illness.

Bristol Palin is opening up about a startling health condition. The 34-year-old daughter of Sarah Palin took to her Instagram stories on Jan. 29 to share that she’s been dealing with facial paralysis for more than a week.