Causes of Quivering Lips?

Answer

Quivering lips might be caused by a variety of nervous disorders. These can include things like Parkinson's disease or trauma to the head or brain. Other causes of quivering lips might include emotions like severe anxiety, stress, fatigue, or even alcohol or caffeine withdrawal. Quivering lips might also come from drinking too much caffeine, from taking certain medications that are stimulants, from eating foods that cause an allergic reaction, or from vitamin deficiencies that cause muscle weakness.
Reference:
Q&A Related to "Causes of Quivering Lips?"
your torture devices.
http://answers.yahoo.com/question/index?qid=201001...
Fear, cold or pain.
http://wiki.answers.com/Q/What+causes+dog+to+quive...
The skin on the lips does not have hair, sweat glands or a protective layer. The lips do not have a function to sweat or create warmth. Therefore, the lips may dry out, become chapped
http://www.ehow.com/about_5510186_causes-swollen-l...
Your lips quivering can betray anxiety or simply be an unwanted discharge of electricity
http://www.chacha.com/question/why-do-lips-and-eye...
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