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with a history of thyroid cancer, your doctors should be giving you extra synthroid thyroid hormone to push your TSH levels down to below 1.0 or 0.5 range
lower TSH levels means less thyroid stimulation hormone which could stimulate any thyroid cancer cells in your body to grow.
if your TSH levels are low, you are more on the hyperthyroid side which can cause more watery stools and faster heart rate and PVCs and heart palpiations.
what is your TSH level when you had your thyroid hormones checked?