The thyroid gland is a vital hormone gland : It plays a major role in the metabolism, growth and development of the human body. The most common cause of a goiter worldwide is due to lack of iodine in the diet. 

It is a butterfly-shaped gland that sits low on the front of the neck and has two side lobes, connected by a bridge (isthmus) in the middle secreting two hormones into the blood : thyroxine (T4) and triiodothyronine (T3).

The hormones regulate the body's metabolic rate, muscle and digestive function, brain development and bone maintenance. 

It presents a swelling with cancer growth affecting the thyroid causing the swelling on one side of the gland. Thyroid cancer isn’t as common as the formation of benign nodules.

  1. Where is the gland located and how does it function for the body?
  2. What are the hormones secreted? 
  3. What are the functions of T3 and T4 hormones? 
  4. What are the types, symptoms & treatment for goitre? 
  5. what are the tests for detection of goitre and estimation of TSH levels? 

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