The causes of multiple biochemical pregnancies include sperm malformation, poor egg quality, chromosomal abnormalities, uterine factors, psychological factors, at the same time, the causes of multiple biochemical pregnancies are not a single factor, it is recommended that couples go to the hospital during pregnancy preparation to discover the causes and deal with them according to the specific situation. 1, sperm malformation: during the process of conception, if the fixed sex partner has a high rate of sperm malformation, it will affect In the process of conception, if the sperm of the fixed sexual partner has a high rate of malformation, it will affect the division, development and implantation of the fertilized egg at a later stage, thus causing early embryonic dysplasia and leading to multiple biochemical pregnancies. Men who smoke, drink alcohol or stay up late for a long time can increase the probability of sperm malformation; 2. Poor egg quality: declining ovarian function and advanced age can cause a decrease in egg quality and hormone secretion. In addition, exposure to radiation, formaldehyde or stimulant drugs during pregnancy preparation can also lead to poor egg quality, resulting in multiple biochemical pregnancies; 3, chromosomal abnormalities: chromosomal number or structural abnormalities in both spouses can affect fertilized egg division, resulting in poor embryonic development in early pregnancy and multiple biochemical pregnancies; 4, uterine factors: some women have abnormal uterine development, submucosal fibroids, endometrium The presence of abnormal uterine development, submucosal fibroids, endometrial polyps, uterine adhesions, endometrial tuberculosis, etc., which is not conducive to the growth and development of fertilized eggs, which can cause multiple biochemical pregnancies; 5, psychological factors: some women have long-term severe anxiety or excessive mental tension, emotions can affect the function of the body, there is a certain possibility of inducing the occurrence of multiple biochemical pregnancies; 6, other: such as hyperthyroidism, severe anemia and other endocrine dysfunction or autoimmune abnormalities If the condition is not well controlled, multiple biochemical pregnancies are likely to occur in women.