The incidence of spontaneous abortion tends to increase among those who visit the clinic for miscarriage. The causes of spontaneous abortion are numerous and complex. Among them, spontaneous abortions secondary to repeated abortions need to be a concern for women of childbearing age. Generally women who have had more than 3 abortions have more than a 25% chance of having an automatic abortion after pregnancy, which can be very harmful to their bodies and even lose their right to motherhood. Spontaneous abortion is usually terminated when the pregnancy is less than 28 weeks and the fetus weighs less than 1000 grams. Miscarriages that occur before 12 weeks of gestation are called early miscarriages, while those that occur between 12 and less than 28 weeks of gestation are called late miscarriages. The incidence of spontaneous abortion is clinically observed to be about 10-15%, but the actual incidence may be much higher than this. Since most of the embryos stop developing within a short period of time after implantation and simply show delayed menstruation, increased menstrual flow or seemingly normal menstrual flow, it is difficult to confirm the true incidence clinically. Some researchers have suggested that the incidence of spontaneous abortion is about 30-40% by blood beta-HCG testing. The incidence of spontaneous abortion increases with the number of pregnancy losses, with a reported risk of 11%-13% for the first pregnancy loss, 13%-17% for the second, and up to 80% for the third embryo loss. The latest diagnostic guidelines of the American Society for Reproductive Medicine state that two or more consecutive spontaneous abortions before the 20th week of pregnancy are considered “recurrent miscarriages” (also known as habitual abortions), with the incidence of recurrent miscarriages being as high as 1-5%, seriously affecting women’s reproductive health, marital relationships and family well-being. The congenital and acquired factors that cause spontaneous abortion are intricately intertwined, including chromosomal abnormalities, luteal dysfunction, polycystic ovary syndrome, diabetes, hypo- or hyperthyroidism, uterine dysplasia or uterine malformation, reproductive tract infections, anxiety, stress, intimidation, smoking, alcoholism, excessive coffee consumption, excessive exposure to certain harmful physical and chemical substances… …These are the things that women should pay more attention to. The treatment of any disease is based on prevention, so as to achieve eugenics. Those who are diagnosed with the disease should take the appropriate treatment according to the cause and get pregnant after it has improved. There is also a kind of recurrent miscarriage of unknown cause. When a pregnant woman has signs of miscarriage, she can be given progesterone treatment or HCG (human chorionic gonadotropin) according to luteinizing insufficiency. Women of childbearing age who are planning to have a baby need to raise their awareness of self-care and treat spontaneous abortion correctly. In a sense, spontaneous abortion follows the natural law of survival of the fittest and is a way for human beings to continuously optimize themselves and not to blindly keep the baby. As for recurrent miscarriage, the key is to find the cause and strive to deal with the cause.