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5. What is Low TSH?

Having too little TSH is hyperthyroidism. When this occurs, the thyroid is overproducing T4, T3, or both, which consequently tells the pituitary gland to stop producing TSH. Low TSH can also be caused by dysfunction of the pituitary gland or central hypothyroidism. In such a case, tests would also show low levels of other pituitary hormones.

Low TSH Hyperthyroidism jarun011 / Getty Images

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