There are many causes of habitual abortion: 1, chromosomal abnormalities. Chromosomal abnormalities in the embryo often lead to degeneration and atrophy of the pregnant egg, and the embryo stops developing at an early stage. Known as genetic factors, couples can make chromosome examination, when possible, can check the chromosomes of the abortion product. 2, endocrine abnormalities. Such as luteal insufficiency, hyper- or hypothyroidism, diabetes and so on. These lesions affect the development of the meconium, placenta and fetus, which may lead to miscarriage. 3.Deformed reproductive organs. Such as bicornuate uterus, unicornuate uterus, mediastinal uterus, saddle uterus, etc., such malformations can lead to insufficient blood flow to the embryo’s landing site in early pregnancy, affecting the development of the embryo. 4, immune factors. Histocompatibility antigens on the father’s side, excessive production of antiphospholipid antibodies or insufficient closed antibodies on the pregnant woman’s side may cause immune rejection and lead to miscarriage. Fetal hemolysis occurs when parents’ blood type is incompatible, which is also a possible cause of miscarriage. 5, infectious factors. Infection of bacteria or viruses and other pathogens during pregnancy, causing high fever or toxins can cause fetal miscarriage or fetal malformation. 6.Environmental factors. Physical and chemical substances in the environment such as radiation, arsenic, lead, formaldehyde, benzene, etc. can directly or indirectly damage the embryo and cause miscarriage. 7, the bad habits and emotions of pregnant women. Bad habits such as excessive smoking, drinking alcohol and coffee. 8, male factors. Factors such as high sperm deformity rate, low vigor, inflammation of male reproductive organs. 9, unknown reasons. Although medicine is now more advanced, but still about half of the recurrent miscarriage can not be identified. Treatment: If spontaneous abortion occurs 2 or even more than 3 times in a row, it should be systematically examined and treated. The patient should cooperate with the doctor and take an active role in the treatment, and the majority of pregnant women can safely pass through the pregnancy and deliver a healthy and lovely baby. In the treatment, it is very important for the patient to remove the burden from her heart and release the psychological pressure. This is very important, because emotional tension, coupled with work pressure, will make the body in a state of stress, the body’s immune system and endocrine disorders, easily lead to miscarriage. You can read popular science books to have a general understanding of the process of pregnancy. For miscarriage during early pregnancy, another pregnancy should be considered after 6 months of miscarriage. Go to the hospital at least 3 months before pregnancy for a medical checkup and discuss the treatment with your doctor. Couples with a history of habitual miscarriage should try to relax, overcome bad moods, get out of harmful environments, stop smoking and drinking alcohol, refrain from drinking coffee-containing beverages, eat a balanced diet, and pay attention to life patterns. Of the causes of miscarriage mentioned above, all can be treated etiologically, except for chromosomal abnormalities for which there is no direct treatment at present. The treatment of the cause should be carried out before the preparation for pregnancy.