Thyroid Function Test for Hypothyroidism and Hyperthyroidism: A Complete Guide The thyroid gland is a small, butterfly-shaped gland in the front of the neck, but the hormones it produces affect many important functions of the body, including metabolism, heart rate, body temperature, energy levels, and growth. When the thyroid produces too little hormone, the condition is called hypothyroidism. When it produces too much, it is called hyperthyroidism.
A thyroid function...
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