The thyroid gland is an organ of the endocrine system responsible for the synthesis of the hormones thyroxine (T3), triiodothyronine (T4) and calcitonin, which, in turn, together with the nervous and immune systems regulate the work of the whole organism. Thyroid diseases become more frequent every year, especially women suffer from them. This is due to the numerous hormonal upheavals that overtake them throughout life, for example, pregnancy and menopause.

The thyroid gland is located on the front of the neck, consists of two lobes and an isthmus between them, normally its weight varies from 20 to 30 g. Its size during life may differ even in the same person. It depends on the age, nature of nutrition, taking medications and many more factors. The thyroid gland is not in a static position, it moves slightly when swallowing or turning the head.

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