Since ancient times, in addition to the excitement and happiness of birth of new offspring, the term delivery has been associated with fear and this has been more tangible in a recent half-century. Today, although maternal mortality due to delivery occurs rarely because of promotion of knowledge and obstetricians' experience, and the establishment of health centers, it hasn’t been eradicated, yet. The causes of "high-risk pregnancies", as the main subject of this book, are discussed briefly.  The risks associated with high-risk pregnancies are; chronic diseases (diabetes mellitus, hypertension, heart diseases,  etc.) maternal malnutrition, pregnancies in mothers younger than 18 or older than 35 years, weight below 45 kg and height shorter than 150 cm, short spacing time between pregnancies less than one year, preeclampsia, placental abruption, Prematurity, mother’s history of systematic diseases before and during pregnancy, mother’s addiction and her deprivation of appropriate pregnancy care, a history of previous pregnancy problems, Rh incompatibility during pregnancy as a result of IVF or other assisted reproductive technologies, and exposure to teratogenic drugs or the occurrence of unplanned pregnancies. The abnormalities threatening mothers' and fetuses' lives as well as Individual, environmental, economic and social factors have critical roles in high-risk pregnancies. Overall, 10-15% of pregnancies are categorized as high-risk and responsible for more than half of deaths and disabilities. Essential care and control of mothers in the postpartum wards is another significant point that can contribute to early detection of problems. The “High-risk pregnancies” book may be useful not only to inform users and scholars but also to educate pregnant mothers.

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