A miscarriage can be defined as a pregnancy that ends spontaneously before the fetus has reached a viable gestational age. There are two types of miscarriages: sporadic (SM) and recurrent (RM). RM is defined by most clinicians as three or more consecutive miscarriages. In this book, the authors discuss topics that include prevention of recurrent miscarriages; autoimmunity and recurrent miscarriages; the efficacy and safety of Chinese medicines for threatened miscarriage; Chinese herbal medicines for recurrent miscarriage; and the genetics of miscarriages.