The thyroid is a small, butterfly shaped gland located at the front of the neck. The thyroid produces the thyroid hormones, including the two major ones, namely the tri-iodothyronine (T3) and thyroxine (T4), which are essential for regulating the metabolic activities, growth, and several other body functions.

The thyroid gland is divided into two halves or lobes, and is connected by a thin