Why threatened abortion?

Threatened abortion is mainly caused by embryonic factors, maternal factors, external factors, immune factors, etc. 1. Embryo factors Embryo itself has chromosome abnormalities and other problems, may lead to its poor development, and then cause threatened abortion. If the genetic material of the embryo is defective, it is often difficult to continue normal development, which is a manifestation of natural selection. 2. Maternal factors The mother has systemic diseases, such as severe infection, high fever, severe anemia, chronic nephritis, etc., which will affect the growth environment of the embryo and increase the risk of abortion. The health status of the mother is very important for the development of the embryo. Any serious disease may interfere with the normal progress of pregnancy. 3. External factors Pregnant women exposed to excessive radiation, chemicals and other harmful environmental factors, or overwork, mental stress, excessive sexual life, etc., may induce threatened abortion. Bad external stimuli and lifestyle may break the balance of pregnancy and cause damage to the embryo. 4. Immune factors Immune incompatibility between mother and embryo, resulting in immune rejection, may also lead to abortion. The immune system plays a complex role in the pregnancy process, abnormal immune response may be detrimental to the embryo.