Placenta previa is a medical condition that occurs during pregnancy, when the placenta partially or completely covers the cervix. This condition is often diagnosed during ultrasound scans and can cause bleeding and other complications. Some synonyms for placenta previa include low-lying placenta, cervical placenta, and lower segment placenta. Other related terms include abruptio placenta, where the placenta separates from the uterine wall prematurely, and placenta accreta, where the placenta attaches too deeply to the uterus. It is important for pregnant women to be aware of these conditions and seek medical attention if they experience any symptoms or concerns.