The branch of medicine dealing with the prevention, diagnosis, and treatment of adult diseases is known as internal medicine. It is also a subfield under veterinary medicine and clinical pharmacy. Doctors who have specialized in this field are called internists. They deal in the management of patients struggling with multi-system disease. They usually care for hospitalized and ambulatory patients. Internal medicine patients are mostly seriously ill and require complex investigations. Some of the main subfields of internal medicine include cardiology, critical care medicine, gastroenterology, nephrology, pulmonology, etc. This book is a compilation of chapters that discuss the most vital concepts and emerging trends in the field of internal medicine. The various advancements in this field are glanced at and their applications as well as ramifications are looked at in detail. This book includes contributions of experts and doctors, which will provide innovative insights into this medical specialty.