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Unilateral facial nerve palsy (FNP), with an incidence of around 25 per 100,000 population, is a common neurologic disorder mimicking a stroke. It often leads to emergency department visits. Bellâs palsy, also known as idiopathic facial paralysis, is the most common cause of unilateral facial paralysis, accounting for approximately 70% of these cases . Bilateral FNP is exceedingly rare, representing less than 2% of all the facial palsy cases, and has an incidence of 1 per 5,000,000 population [2, 3].
The cause of Bell's palsy is not clear. Most cases are thought to be caused by the herpes virus that causes cold sores. In most cases of Bell's palsy, the nerve that controls muscles on one side of the face is damaged by inflammation.Many health problems can cause weakness or paralysis of the face. If a specific reason cannot be found for the weakness, the condition is called Bell's palsy. Symptoms of Bell's palsy include:1  Sudden weakness or paralysis on one side of your face that causes it to droop. 2  Drooling. 3  Eye problems, such as excessive tearing or a dry eye. 4  Loss of ability to taste. 5  Pain in or behind your ear. 6  Numbness in the affected side of your face. 7  Increased sensitivity to sound.n most cases of Bell's palsy, the nerve that controls muscles on one side of the face is damaged by inflammation. Many health problems can cause weakness or paralysis of the face. If a specific reason cannot be found for the weakness, the condition is called Bell's palsy. Symptoms of Bell's palsy include: