Bell’s palsy causes sudden weakness in your facial muscles. This makes half of your face appear to droop. Your smile is one-sided, and your eye on that side resists closing.
Bell’s palsy, also known as facial palsy, can occur at any age. The exact cause is unknown, but it’s thought to be the result of swelling and inflammation of the nerve that controls the muscles on one side of your face. It could be a reaction that occurs after a viral infection.
For most people, Bell’s palsy is temporary. Symptoms usually start to improve within a few weeks, with complete recovery in about six months. A small number of people continue to have some Bell’s palsy symptoms for life. Rarely, Bell’s palsy can recur.
Signs and symptoms of Bell’s palsy come on suddenly and can include:
▪ Rapid onset of mild weakness to total paralysis on one side of your face — occurring within hours or days.
▪ Facial droop and difficulty making facial expressions, such as closing your eye or smiling.
▪ Pain around the jaw, or in or behind your ear on the affected side.
▪ Increased sensitivity to sound on the affected side.
▪ A decrease in your ability to taste.
▪ Changes in the amount of tears and saliva you produce.
In rare cases, Bell’s palsy can affect the nerves on both sides of your face.
Bell’s palsy is often linked to exposure to a viral infection. Viruses that have been linked to Bell’s palsy include the virus that causes:
▪ Cold sores and genital herpes (herpes simplex).
▪ Chickenpox and shingles (herpes zoster).
▪ Mononucleosis (Epstein-Barr).
▪ Cytomegalovirus infections
▪ Respiratory illnesses (adenovirus)
▪ German measles (rubella)
▪ Mumps (mumps virus)
▪ Flu (influenza B)
▪ Hand-foot-and-mouth disease (coxsackievirus)
With Bell’s palsy, the nerve that controls your facial muscles, which passes through a narrow corridor of bone on its way to your face, becomes inflamed and swollen — usually related to a viral infection. Besides facial muscles, the nerve affects tears, saliva, taste and a small bone in the middle of your ear.
Bell’s palsy occurs more often in people who:
▪ Are pregnant, especially during the third trimester, or who are in the first week after giving birth.
▪ Have an upper respiratory infection, such as the flu or a cold.
▪ Have diabetes.
Also, some people who have recurrent attacks of Bell’s palsy, which are rare, have a family history of recurrent attacks. In those cases, there might be a genetic predisposition to Bell’s palsy.
Seek immediate medical help if you experience any type of paralysis, because you might be having a stroke. Bell’s palsy isn’t caused by a stroke. See your doctor if you experience facial weakness or drooping to determine the underlying cause and severity of the illness.