Biochemical refers to a biochemical pregnancy, a state in which a fertilized egg stops developing before it can attach to the uterus, and is a subclinical abortion. The root cause of biochemical pregnancy may be related to the decline in the quality of the woman’s eggs or chromosomal abnormalities, such as chromosomal abnormalities in the woman herself, autoimmune disorders, polycystic ovary syndrome, etc. may affect the normal development of the embryo, and did not achieve the development of fertilized eggs to bed. In biochemical pregnancy, although the chorionic gonadotropin level is elevated, the fertilized egg does not implant and is discharged with menstruation, which is also known as subclinical miscarriage, and generally does not need to be treated. It is necessary to determine whether there is insufficient progesterone secretion, luteal insufficiency, uterine dysplasia, endometrial polyps, excessive mental stress, etc.. For patients with recurrent biochemical pregnancies, it is recommended that they can consult the Obstetrics and Gynecology Department of regular hospitals in order to clarify the cause of the disease and timely treatment.