In this edition, additional contents, which are very useful for classrooms, postings, wards, and clinics, have been attached in every section and to make it easier to find the relevant information. All the topics have been explained in a point-wise manner and very simple language. The aim is to enrich the students and other readers with refined knowledge and to give them a complete understanding of all the topics. This book would be useful and informative for undergraduates, postgraduates, and professionals.