Facial Nerve Problems and Bell's Palsy Causes by MedicineNet.com

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February 8, 2012

Facial Nerve Problems and Bell's Palsy

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Bell's Palsy Causes

What are the causes of Bell's palsy?

Bell's palsy occurs when the nerve that controls the facial muscles is swollen, inflamed, or compressed, resulting in facial weakness or paralysis. Exactly what causes this damage, however, is unknown.

Many scientists believe that viral infections such as the virus the causes cold sore virus -- herpes simplex -- can cause the disorder. They believe that the facial nerve swells and becomes inflamed in reaction to the infection, causing pressure within the Fallopian canal and leading to ischemia (the restriction of blood and oxygen to the nerve cells). In some mild cases (where recovery is rapid), there is damage only to the myelin sheath of the nerve. The myelin sheath is the fatty covering-which acts as an insulator-on nerve fibers in the brain.

The disorder has also been associated with influenza or a flu-like illness, headaches, chronic middle ear infection, high blood pressure, diabetes, sarcoidosis, tumors, Lyme disease, and trauma such as skull fracture or facial injury.

Read more in-depth information about the causes of Bell's palsy »

SOURCE: National Institute of Neurological Disorders and Stroke. Bell's Palsy Fact Sheet.

What is the facial nerve?

The facial nerve is a nerve which controls the muscles on the side of the face. It allows us to show expression, smile, cry, and wink. Injury to the facial nerve causes a socially and psychologically devastating physical defect; treatment may require extensive rehabilitation or multiple procedures.

The facial nerve is the seventh of the twelve cranial nerves. Everyone has two facial nerves, one for each side of the face. The facial nerve travels with the hearing nerve (the eighth cranial nerve) as it travels in and around the structures of the middle ear. It exits the front of the ear at the stylomastoid foramen (a hole in the skull base), where it then travels through the parotid gland. In the parotid gland it divides into many branches which provide motor function for the various muscles and glands of the head and neck.

What are symptoms of a facial nerve problem?

Facial nerve problems may result in facial muscle paralysis, weakness, or twitching of the face; dryness of the eye or the mouth; or alteration of taste on the affected side. However, the finding of one of these symptoms does not necessarily imply a specific facial nerve problem; your physician needs to make a careful investigation in order to make a precise diagnosis.

What conditions affect the facial nerve?

There are numerous causes of facial nerve disorder:

  • Nervous system disease: including Opercular syndrome, Millard-Gubler syndrome.
  • Infection: of the ear or face, or herpes zoster of the facial nerve (Ramsey-Hunt syndrome).
  • Tumors: acoustic neuroma, schwannoma, cholesteatoma, parotid tumors, glomus tumors.
  • Bell's palsy: Also called idiopathic facial nerve paralysis (see below).



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Facial Nerve Problems and Bell's Palsy

Lyme disease facts

  • Lyme disease is a bacterial illness that is spread by tick bites.
  • Lyme disease can affect the skin, joints, heart, and the nervous system.
  • Lyme disease occurs in phases -- the early phase beginning at the site of the tick bite with an expanding ring of redness.
  • Lyme disease is diagnosed based on the patient's clinical signs of illness and the detection of Lyme antibodies in the blood.
  • Lyme disease is treated with antibiotics.

What is Lyme disease? What causes Lyme disease?

Lyme disease is a bacterial illness caused by a bacterium called a "spirochete." In the United States, the actual name of the bacterium is Borrelia burgdorferi. In Europe, another bacterium, Borrelia afzelii, also causes Lyme disease. Certain ticks found on deer harbor the bacterium in their stomachs. Lyme disease is spread by these ticks when they bite th...

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