Thyroid is a small gland which has the shape like a butterfly that sits low on the front of the neck. It is a vital hormone gland which plays a major role in the metabolism, growth and development of the human body. In other words, it helps to regulate many body functions by constantly releasing a steady amount of thyroid hormones into the bloodstream. Thyroid Gland is a part of an endocrine system.
- T3 – Triiodothyronine: This hormone contains three atoms of iodine and is often called T3.
- T4 – Thyroxine: This hormone contains four atoms of iodine and is often called T4.
A normal thyroid gland produces about 80% (T4) and about 20% (T3). When the level of hormones drops very low, your heart rate may slower than normal and if it shoots up high then you may have a rapid heart rate. Therefore, to balance T3 and T4 hormones TSH plays a vital role.
TSH is produced by a gland in the brain called pituitary gland. When hormone levels are low in your body then pituitary gland makes more TSH and when hormone levels are high pituitary gland makes less TSH. In other words, TSH levels that are too high or too low can indicate your thyroid is not working properly.
There are specific kinds of thyroid disorders that includes: