See your doctor: In the absence of other symptoms, these are likely benign "fasciculations". Causes include dehydration, recent overexertion, abnormal electrolyte levels such as sodium, potassium, or calcium levels, increased stress levels/caffeine intake, etc. If the twitching is frequent, affects different muscles every time, or is associated with other symptoms like muscle cramps or weakness, see your doctor.
Answered 4/5/2016
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