Does Clear Correct cause painful headaches?

I've been on Clear Correct trays for half a year now and have recently begun experiencing severe, painful headaches. They are sharp and typically begin in one warm spot and then expand in a matter of seconds. The pain usually lasts no more than a few minutes. Can these be caused by my teeth moving (because I have notice quite the improvement)? Or can these scary headaches be caused by stress/anxiety?

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