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What are some causes of low TSH levels?

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Causes of low thyroid-stimulating hormone, or TSH, levels include hyperthyroidism; a damaged pituitary gland that is unable to make TSH, called secondary hypothyroidism; and taking excess thyroid medicine when treating an underactive thyroid gland, explains WebMD. Women may experience low TSH levels in the first three months of pregnancy.

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Hyperthyroidism means the thyroid gland is overactive, which is caused by conditions such as a noncancerous tumor called a toxic nodule, Graves' disease and a toxic multinodular goiter, notes WebMD.

Patients suffering from severe stress or a chronic illness, or who are taking medications such as corticosteroids and heparin may produce test results that are inconclusive, according to WebMD. The thyroid-stimulating hormone test is done to make sure the thyroid is functioning properly and to check the efficacy of thyroid treatments.

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