Biochemical pregnancy is an early miscarriage that occurs after pregnancy and therefore counts as having carried a child. It has a variety of causes and is mainly characterized by vaginal bleeding and abdominal pain, and requires no special treatment if there is no infection or residue in the uterine cavity. Biochemical pregnancy refers to early miscarriage that occurs before menstruation, also known as hidden miscarriage, embryo chromosomal abnormality is the most common cause of biochemical pregnancy, followed by maternal endocrine abnormalities, immune function abnormalities, chromosomal abnormality of sperm, and so on. Clinical manifestations include vaginal bleeding and paroxysmal pain in the lower abdomen. Clinical diagnosis can be confirmed by history taking and blood and urine tests for human chorionic gonadotropin. If there is no residue in the uterine cavity and the mother is not infected after ultrasound examination, no special treatment is needed. If there is any discomfort, it is recommended to go to the hospital for examination and treatment as prescribed by the doctor.