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Hi Jen,   I agree with the first answer that it could be related to anxiety, but behavior like this may also result from a number of physical maladies, so I have some sympathies with the second answer.   My view is that you first need to rule out the physical before you consider the psychological. Therefore my first port of call would be the doctor. Meanwhile, you might like to consider when this behavior first started, what situations it occurs in and what happens when it occurs/what stops it. I think all this information will help during any consultation you have, medical or psychological.   I suspect this isn't the case but if the behavior is very recent and unexpected, or if it is accompanied by raised temperature or rashes etc you need medical help quickly