Endocrinology is a specialized field of medicine that focuses on the endocrine system, which includes glands that produce hormones to regulate various bodily functions. This field encompasses a wide range of disorders related to hormone imbalances and dysfunctions. These include thyroid disorders, polycystic ovary syndrome, and adrenal gland disorders. Thyroid disorders can involve either an overactive or underactive thyroid gland. Treatment options for these type of disorders may include medication to restore hormone balance, radioactive iodine therapy, or in some cases, surgical removal of the thyroid gland. Polycystic ovary syndrome is a hormonal disorder that affects women and can cause irregular menstrual periods, excess hair growth and fertility problems. The book aims to shed light on some of the unexplored aspects of endocrinology and the recent researches in this field. It will serve as a valuable source of reference for graduate and postgraduate students.