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Thyroid
The thyroid is a small, butterfly-shaped endocrine gland in the front of the neck that controls how the body uses energy, grows, and manages metabolism. You can learn more about its role and health conditions via MedlinePlus Thyroid Diseases.Where It Is and What It DoesLocation: Sits right under the skin at the base of the front of the neck, just below the voice box.Hormones made: Produces key chemical messengers called T3 (triiodothyronine) and T4 (thyroxine).Main job: Acts like a speed control switch (metabolism) for nearly every organ, tissue, and cell in the body.Common Thyroid ProblemsHypothyroidism: The gland is underactive and makes too few hormones, causing the body to slow down (leading to tiredness and weight gain).Hyperthyroidism: The gland is overactive and makes too many hormones, speeding the body up (leading to fast heartbeat and weight loss).Goiter: An abnormal swelling or enlargement of the thyroid gland.