The endocrine system is an organ system comprising of the endocrine glands, the hormones that they secrete and the feedback loops that control the release of these hormones. Some endocrine glands are pancreas, pituitary gland, adrenal gland, etc. These hormones are important for the regulation of the functions of various target organs and for the maintenance of homeostasis. Endocrinology is a branch of medicine and biology that deals with the study of the endocrine system, its diseases and endocrine hormones. Endocrine disorders may be subdivided into endocrine gland hypersecretion, endocrine gland hyposecretion and tumors. Some examples are hyperthyroidism and hypothyroidism, diabetes, goitre, hypogonadism, etc. This book is a valuable compilation of topics, ranging from the basic to the most complex advancements in the field of clinical endocrinology. It presents the complex subject of endocrinology in the most comprehensible and easy to understand language. With state-of-the-art inputs by acclaimed experts of this field, this book targets students and professionals.