There is still a big difference between spontaneous abortion and induced abortion, as follows: 1. Spontaneous abortion: refers to the natural termination process of the embryo during its growth and development, which is generally related to the chromosomal or genetic abnormalities of the embryo itself, and also related to the abnormalities of the woman’s uterine cavity environment, such as uterine adhesions and malformed uterine cavity. In some cases, spontaneous abortion may also occur due to insufficient progesterone levels and insufficient luteal function in the woman’s body. The abortion may cause bleeding, lower abdominal distension, lumbago, back pain, spontaneous abortion may have a complete spontaneous abortion or incomplete abortion, and the need to clear the end of the uterus. 2, abortion: a way to terminate pregnancy through drug abortion or abortion, there may be irreversible damage to the basal layer of the female uterus, abortion is a process of artificial termination of pregnancy.