4 doctors weighed in:
Is it possible to have a very overactive thyroid even if your TSH levels are in normal range?
4 doctors weighed in

Dr. Robert Lang
Internal Medicine - Endocrinology
2 doctors agree
In brief: Very unlikely
A very overactive thyroid is virtually always associated with a very low or undetectable tsh.
Of course a laboratory error could be responsible and the test should always be repeated if it does not fit with the clinical picture. Lastly, stress and/or an underactive adrenal gland can sometime mimic and overactive thyroid.

In brief: Very unlikely
A very overactive thyroid is virtually always associated with a very low or undetectable tsh.
Of course a laboratory error could be responsible and the test should always be repeated if it does not fit with the clinical picture. Lastly, stress and/or an underactive adrenal gland can sometime mimic and overactive thyroid.
Dr. Robert Lang
Dr. Robert Lang
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1 comment
Dr. Sunil Prof. Wimalawansa
I agree. Moreover, if one takes too much thyroxin or someone who is very sick (like patients in the ICU) may have normal TSH levels while be thryrotoxic; as it may take a little while to decrease the blood TSH levels by feedback mechanisms.
Dr. Vered Lewy-Weiss
Pediatrics - Endocrinology
In brief: Very rarely
With resistance to thyroid hormone, such a rare patient could have elevation in thyroid hormone levels independent of a suppressed pituitary tsh.
This disorder is very rare and is the result of a thyroid hormone receptor defect making the pituitary less responsive to suppression from thyroid hormones. Under normal circumstances, hyperthyroidism suppresses tsh.

In brief: Very rarely
With resistance to thyroid hormone, such a rare patient could have elevation in thyroid hormone levels independent of a suppressed pituitary tsh.
This disorder is very rare and is the result of a thyroid hormone receptor defect making the pituitary less responsive to suppression from thyroid hormones. Under normal circumstances, hyperthyroidism suppresses tsh.
Dr. Vered Lewy-Weiss
Dr. Vered Lewy-Weiss
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