Placenta previa does not usually cause frequent contractions, but if it does and frequent contractions occur, it is important to be on the lookout for abnormal symptoms such as hemorrhage after delivery. Placenta hypoplasia indicates that the placenta is attached to the uterus in a low position, and generally does not cause frequent contractions. Even if contractions occur during pregnancy, they are irregular and infrequent, false contractions. But once the placenta hypoplasia pregnant women have frequent contractions, it means that it is the precursor of labor, and we need to be vigilant about the occurrence of postpartum hemorrhage and other life-threatening symptoms, which may be accompanied by abdominal pain, vaginal bleeding and other abnormal symptoms. Once a pregnant woman finds that her placenta is hypoplastic and has frequent contractions, she needs to consult a doctor in a timely manner, and under the guidance of the doctor to improve the relevant examinations and then carry out targeted treatment, and do not delay, to avoid accidents.