Two possibilities: The great majority of cases with low TSH are due to high thyroid hormone levels from hyperthyroidism or taking too much thyroid hormone. Rarely, a pituitary problem can lead to low tsh. In the first case, there will usually be symptoms of hyperthyroidism and in the second, symptoms of hypothyroidism.
Answered 9/28/2016
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Low TSH: means your thyroid hormone is to high.
Answered 7/8/2014
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