Mandy and her husband in the United States had always wanted to have a baby, but they had to choose artificial in vitro fertilization for medical reasons. Mandy miscarried after 20 weeks of pregnancy, which was too upsetting for her and her family. Doctors warned Mandy that her uterine structure could lead to another miscarriage, so she was advised to choose adoption or surrogacy, so Mandy’s mother, Dixon, chose to give her daughter a surrogate. In any case, thanks to the efforts of her doctors 51-year-old Dixon finally managed to conceive and give birth to her baby. Dixon is a great mother for making such a big sacrifice for her daughter and her offspring. After reading this, I believe we are all saddened; so, what are the main reasons for the occurrence of habitual abortion, the “culprit” in the above example, do you know? (1) rapid emotional changes: the pregnant woman’s emotions are greatly stimulated, excessive sadness, shock, fear, and excessive emotional excitement, can cause the pregnant woman’s internal environmental imbalance, prompting the uterus contraction caused by miscarriage. (2) Inadequate embryo development: Abnormal pregnancy egg is the main cause of early miscarriage. About 80% of the miscarriages in the first two months of pregnancy are due to some kind of defect in the sperm and egg, resulting in the termination of the embryo development to a certain extent. (3) Endocrine dysfunction: The fertilized egg can only be laid on the uterine wall and grow into a fetus under the action of progesterone. When there is insufficient secretion of progesterone in the body, the uterine meconium will be poorly developed, thus affecting the development of the fertilized egg and easily causing miscarriage. If prostaglandins are increased, it will cause frequent contractions of the uterine muscles, which will also lead to miscarriage. Decreased thyroid function can lead to impaired cellular oxidative capacity, which can also affect the growth and development of the embryo and lead to miscarriage. (4) Placental dysplasia: The fetus grows and develops in the mother’s body, mainly through the placenta, which transports nutrients and oxygen from the mother to the fetus. If the placenta is dysplastic or has diseases, the fetus will stop growing and cause miscarriage if it does not receive nutrients and oxygen. (5) Mother and child blood type incompatibility: the pregnant woman has received blood transfusion in the past, or in the process of pregnancy and blood type incompatible coagulation factors, will cause the fetus body cells agglutination and hemolysis, thus causing miscarriage. (6) Reproductive organ diseases: cervical insufficiency, uterine abnormalities including abnormal uterine development, malformation, obvious uterine ectopic, submucosal fibroids, uterine adhesions, etc. may lead to miscarriage. Finally: the causes of habitual miscarriage are more complex, and women suffering from this disease should go to the hospital for a comprehensive systematic examination. After a miscarriage, especially in women with ovarian dysfunction and uterine insufficiency, it is best to conceive after three normal menstrual cycles to allow enough time to recover the hormones and endometrial function in the body.