Gestational diabetes mellitus (GDM) is a condition characterized by the presence of a degree of glucose intolerance during pregnancy. A woman is assesed with gestational diabetes when glucose intolerance persists beyond 24 to 28 weeks of gestation. Certain risk factors predispose a woman to develop GDM, such as polycystic ovary syndrome, age that is above 35 years, a previous history of GDM or impaired glucose tolerance, obesity, etc. A blood glucose test showing glucose levels higher than 126 mg/dl after fasting can indicate gestational diabetes. Other diagnostic techniques include urinary glucose testing, oral glucose tolerance test and screening glucose challenge test. The treatment of GDM is possible with insulin, diet and lifestyle modifications. Regular exercise, self-monitoring glucose and behavioral interventions can reduce the effects of GDM on the mother and child. This book provides comprehensive insights into gestational diabetes mellitus. Also included herein is a detailed explanation of the various management strategies of gestational diabetes mellitus. This book is meant for students who are looking for an elaborate reference text on this condition.