This book provides comprehensive information on continuous glucose monitoring (CGM). The first section focuses on the fundamentals of CGM technology, including the principles of CGM, accuracy assessment, operation procedure, management processes, the picture-interpretation methodology, the clinical value of CGM parameters, reference values, clinical applications of CGM report and management systems, and clinical indications. In turn, the second section describes the clinical application of CGM, including assessing blood glucose fluctuation and hypoglycemic effects, detecting hypoglycemia and identifying fasting hyperglycemia. It also describes the role of CGM in connection with specific diseases, such as fulminant type 1 diabetes, gestational diabetes mellitus, steroid diabetes, and insulinoma. The closing chapter outlines the future of CGM. In addition, the book presents typical cases and analyses of nearly a hundred typical monitoring maps. As such, it offers diabetic health care doctors a valuable reference guide to the clinical application of and scientific research on CGM.