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The thyroid gland is a butterfly-shaped organ located in the lower part of the neck, in front of the windpipe. It plays a crucial role in the body’s endocrine system, a network of glands that produce and release hormones. The main function of the thyroid gland is to produce, store and release thyroid hormones into the bloodstream. These hormones are thyroxine (T4) and triiodothyronine (T3), and they have a significant impact on metabolism, the way the body uses energy.
Thyroid hormones affect almost all organs of the body and regulate numerous metabolic processes, which means that they influence the speed and efficiency with which cells convert and use energy. One example of their action is the regulation of body temperature and energy expenditure. In addition, these hormones play an important role in brain development, especially during the fetal period and in childhood, as well as in the regulation of heart rate and cholesterol levels.
The function of the thyroid gland is regulated by another hormone, thyrotropin or thyroid-stimulating hormone (TSH), which is released by the pituitary gland (another gland of the endocrine system located in the brain). TSH signals the thyroid gland how much T3 and T4 to produce and release based on the body’s needs.
Disorders of thyroid function can lead to various health problems. An overactive thyroid (hyperthyroidism) causes the metabolism to speed up, which can cause symptoms such as weight loss, nervousness, palpitations and heat intolerance. An underactive thyroid (hypothyroidism) slows down the metabolism, which can lead to weight gain, fatigue, cold intolerance and depression. Both conditions require proper medical evaluation and treatment to maintain the balance of thyroid hormones and the health of the body.
