Pregnancy without fetal heart may be caused by chromosomal abnormalities, parental factors, environmental factors and other reasons. 1. Chromosomal abnormality: If the fetus has chromosomal abnormality or some organs develop abnormally during development, it may cause the fetus to lose fetal heart. 2. Parental factors: If the mother has systemic diseases such as high blood pressure, liver and kidney diseases, or other serious infections before pregnancy, it may also lead to the absence of fetal heartbeat during the development of the fetus. 3. Environmental factors: In addition to the above factors, there are also pregnant women in pregnancy, if there is an unhealthy environment, such as containing arsenic, formaldehyde and other chemicals and other environments, or too much exposure to radioactive rays, etc., will also lead to the fetus does not have fetal heart. Pregnant women who have no fetal heart phenomenon, you should consult a doctor in a timely manner, follow the doctor’s instructions to identify the cause of the disease, to take regular measures.