What Is Low TSH?


Low TSH refers to abnormally low levels of thyroid stimulating hormone in the bloodstream, potentially resulting from an array of conditions and causing a condition known as hyperthyroidism.


  • The thyroid secretes hormones thyroxine (t4) and triiodothyronine (t3) into the bloodstream. The pituitary gland releases amounts of thyroid stimulating hormone (TSH) based on the levels of thyroxine and triiodothyronine.


  • High levels of thyroxine and triiodothyronine occur due to abnormal thyroid function. Excessive amounts of thyroxine in the blood plasma decreases the production of TSH, leading to low TSH levels.


  • Low TSH is caused by conditions that increase thyroxine production such as Graves' disease, thyroiditis, and thyroid nodules, which are benign tumors symptomatic of Plummer's disease and goiter.


  • Low THS levels cause abnormal thyroid function such as hyperthyroidism, a condition resulting in an overactive thyroid, with symptoms of weight loss, malaise, insomnia, elevated heart rate, temperature sensitivity and nervousness.


  • Low TSH is diagnosed by evaluating pituitary hormone and TSH levels in the bloodstream. TSH testing includes: iodine uptake and thyroid scans, pituitary production and serum thyroid hormone measurements and TRH tests.

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