Also twitching can be a sign of low blood sugar.
If it only occurs near a needed meal time, or fasting overnight, I'd look at a snack. I've read that 70% of people with low blood sugars attacks have twitching muscles at some point.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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