Depends: Different nerves go to each side of the lip. If it is ONE side of the lip, it is a nerve problem. It won't be one sided. Then it is an electrolyte or other metabolic effect of all nerves. Panic and hyperventilation is most common, but electrolyte loss (including medicines), sick nerves, hormonal abnormalities and many others.
Answered 10/14/2015
2.1k views
Lip numbness: may come from local nerve irritation or an effect of medications. Or stress. Or Bell's palsy (though that sticks around). Twitching is more of a muscle spasm and may be associated with calcium or magnesium abnormalities. or potassium.
Answered 10/15/2016
2.1k views
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