Recurrent miscarriage, also known as habitual miscarriage, is a condition in which a woman has two or more consecutive spontaneous miscarriages (that is, pregnancy loss of less than 28 weeks of gestation with a fetus weighing less than 1,000 grams) or biochemical pregnancies (in which sperm-egg union develops into a fertilized egg but does not implant in the uterus). The causes of recurrent miscarriage are complex and commonly include genetic and immunologic factors. Genetic factors are mainly chromosomal abnormalities, which include chromosomal abnormalities present in at least one of the couple and may also be present during embryonic development. Immune factors are when the maternal immune system attacks the embryo, or when the maternal immune system is intolerant to the embryo can also lead to recurrent miscarriage. In addition, recurrent miscarriage can also occur when the mother develops a reproductive tract infection, congenital uterine abnormalities, or insufficient luteal secretion. Recurrent miscarriages can be characterized by small or heavy vaginal bleeding, pain in the lower back and lower abdomen, and when the embryo is slightly larger, premature rupture of membranes and vaginal discharge may also occur. In order to avoid miscarriage and its complications, it is necessary to immediately go to the obstetrics and gynecology department of the hospital for fertility preservation treatment, and if there is heavy bleeding, it is necessary to follow the doctor’s instructions to use medication to stop bleeding, and in the case of retained embryos, it is necessary to carry out a surgical procedure to remove the uterus.