Causes of poor pregnancy include pelvic inflammatory diseases, reproductive tract tuberculosis, endometriosis, congenital uterine abnormalities, endocrine disorders, male infertility and so on. 1. Pelvic inflammatory disease: inflammation of the fallopian tubes caused by adhesion, obstruction, resulting in poor pregnancy. 2. Genital tuberculosis: tubal breakage with adhesion and obstruction leads to bad pregnancy, and the success rate of pregnancy after treatment of genital tuberculosis is low. 3. Endometriosis: pelvic microenvironmental changes, adhesions around the ovaries and fallopian tubes lead to infertility. 4. Congenital abnormalities of uterine development: uterine malformation, tubal malformation, etc. are also not easy to get pregnant. 5. Endocrine disorders: for example, the hypothalamus-pituitary-ovarian axis has a lesion, the secretion of gonadotropins is reduced also not easy to get pregnant. 6. male infertility: male azoospermia, oligospermia, sperm deformities and so on and lead to infertility. In addition, there are other reasons why a woman may not be able to get pregnant, so it is advisable to go to the hospital for the appropriate examination to find the cause of the disease and treat it as soon as possible.