By eHow Health Editor
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Bells Palsy affects people of all ages, but it's most common in people who are pregnant, have autoimmune deficiencies or upper respiratory ailments. It's a paralysis on one side of the face caused by the swelling of facial nerves. The exact cause isn't known, but it isn't dangerous and will eventually go away. A physician will need to confirm a diagnosis, but there are signs and symptoms you can look for.
eHow Health Editor