Hypothyroidism has been extensively examined in this book. Hypothyroidism is considered as a very complicated issue than just a simple prescription of levothyroxine tablet and requires significant attention of the clinicians, researchers and general masses. This book is intended for those people who wish to acquire more extensive information regarding the management of thyroid dysfunction in pregnancy, childhood, at birth or in subclinical stages. It serves as an efficient guide for those who wish to perform thyroid ultrasound in hypothyroid patients. The book consists of a collection of various outstanding review articles by authors from across the globe, which helps the readers to form their own opinion.