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A high TSH level—above 4.5 mU/L—indicates an underactive thyroid, also known as hypothyroidism. This means your body is not producing enough thyroid hormone. A high TSH means different things depending on whether a person has known thyroid disease.
Thyroid-stimulating hormone (TSH) triggers your thyroid to release its hormones, which mainly impact your body’s metabolism. High TSH levels usually indicate hypothyroidism, and low TSH levels usually indicate hyperthyroidism.
If the results show that TSH is high and T-4 is low, then the diagnosis is hypothyroidism. In some cases, the thyroid hormone T-3 may be measured as well. If the second test shows high TSH but T-4 and T-3 are in the standard range, then the diagnosis is a condition called subclinical hypothyroidism.
High levels of TSH is an indicator that your thyroid is not producing enough hormones, like thyroxine (T4) and or triiodothyronine (T3). This hormonal imbalance is called primary hypothyroidism . Sometimes high TSH causes a decrease in thyroid hormones, but they are still in normal range.
High TSH levels indicate that a person has an underactive thyroid, meaning it is not producing enough essential hormones. Symptoms of hypothyroidism include fatigue, weight gain, and thinning...
When TSH levels are persistently high, that usually means something is wrong with the thyroid gland. It’s not producing enough thyroid hormone, so the hormone system releases more TSH to increase thyroid hormone production. Healthcare providers call this primary hypothyroidism or underactive thyroid. Thyroid hormones are critical to human life.
A high TSH level indicates that the thyroid gland is not making enough thyroid hormone (primary hypothyroidism). The opposite situation, in which the TSH level is low, usually indicates that the thyroid is producing too much thyroid hormone (hyperthyroidism).