Symptoms:

Sometimes you may have a cold shortly before the symptoms of Bell's palsy begin.

Symptoms most often start suddenly, but may take 2 - 3 days to show up. They do not become more severe after that.

Symptoms are almost always on one side only. They may range from mild to severe.

The face will feel stiff or pulled to one side, and may look different. Other symptoms can include:

• Difficulty eating and drinking; food falls out of one side of the mouth
• Drooling due to lack of control over the muscles of the face
• Drooping of the face, such as the eyelid or corner of the mouth
• Hard to close one eye
• Problems smiling, grimacing, or making facial expressions
• Twitching or weakness of the muscles in the face

Other symptoms that may occur:

• Dry eye or mouth
• Headache
• Loss of sense of taste
• Sound that is louder in one ear (hyperacusis)
• Twitching in face

Signs and tests:

Often, Bell's palsy can be diagnosed just by taking a health history and doing a complete physical exam.

If your health care provider is worried that a brain tumor is causing your symptoms, you may need:

• CT scan of the head
• Magnetic resonance imaging (MRI) of the head

Sometimes, you will need a test to check the nerves that supply the muscles of your face:

• Electromyography (EMG)
• Nerve conduction test