Can be many reasons: Tongue twitching can have benign (excess caffeine, lack of sleep, anxiety, fatigue, stress, overwork) or severe (ALS, demyelination, tumor) causes. Given your age and a "clean" EMG of the tongue, it is less likely due to a serious cause. However, you should follow-up with a neurologist to review all your study results. Ref: http://www.nlm.nih.gov/medlineplus/ency/article/003929.htm
Answered 12/29/2015
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