The book endows with an impression of the basis and ways to better understanding of endocrinology. It is relatively one of the newer super-specialties of internal medicine. The book is a compilation of chapters related to the specialty of endocrinology. It is divided into five main sections that reflect the physiologic roots of endocrinology. Indeed, it will help for the beginners to develop. We hope you find this book useful in your effort to achieve continuous learning.