Pregnancy complications are health problems that occur in the baby or mother during pregnancy. Some pregnancy complications are more serious than others and may threaten the life of the mother or baby. Common pregnancy complications include high blood pressure and diabetes during pregnancy, vaginal bleeding due to problems with the placenta, and premature birth. Proper prenatal care and testing can help prevent, detect, and control some pregnancy complications. If you develop a complication during pregnancy, you will be closely monitored by a doctor. Follow the links below to find WebMD's comprehensive coverage about pregnancy complications, from the warning signs to treatment, and much more.