What is Hyperthyroidism?

Hyperthyroidism signifies overactive tissue within the confines of the thyroid gland. The condition results in an overproduction of T3 or triiodothyronineT4 or thyroxin which are essentially thyroid hormones. Thus hyperthyroidism is a cause that leads to  thyrotoxicosis, a clinical condition that involves increased levels of thyroid hormones in human blood.