The thyroid is a butterfly-shaped endocrine gland that sits in the front of the neck and secretes hormones straight into the bloodstream. It produces a number of hormones, including as calcitonin, which aids in maintaining bone mineral density, and triiodothyronine (T3) and tetraiodothyronine (Thyroxine) (T4), which assist regulate the body's growth, development, and metabolism. An internal feedback cycle controls the levels of thyroid hormones in our bodies. Thyrotropin-releasing hormone (TRH), which is secreted by the brain's hypothalamus, triggers the pituitary gland to release thyroid stimulating hormone (TSH), which regulates the release of T3 and T4, contingent upon blood levels. The pituitary gland secretes more thyroid hormones (TSH) in response to a drop in blood levels of T3 and T4, while a rise in these levels causes a decrease in TSH levels. When blood TSH is low and T3 and T4 levels are high, it indicates hyperthyroidism, an overactive thyroid gland. Conversely, low T3 and T4 levels along with high TSH levels are signs of hypothyroidism, which is caused by an underactive thyroid gland.
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