Fetal arrest refers to the cessation of embryonic development in early pregnancy due to some reasons. The ultrasound examination shows that there is no fetal bud in the gestational sac or the fetus is irregular in shape, no fetal heartbeat, or the gestational sac is withered. Most pregnant women have no obvious symptoms after the fetus stops developing, some of them may see redness and usually no abdominal pain. Fetal arrest is a type of spontaneous abortion, and 2 or more spontaneous abortions are called recurrent spontaneous abortions. The common clinical causes of fetal abortion 1. Infectious factors Mycoplasma infection (1) The number of embryonic arrests is positively correlated with the positive rate of mycoplasma and chlamydia infection. (2) Subclinical mycoplasma infection is an important cause of spontaneous abortion, especially recurrent abortion. (2) Endocrine factors Embryonic arrest due to endocrine disorders accounts for 23% to 67% of early spontaneous abortions. 3, immune factors The implantation of fertilized eggs in the mother can be regarded as a semi-homologous transfer phenomenon; the number of embryonic arrests is positively correlated with abnormal immune function. Relationship between fetal arrest and secondary infertility Normal sperm and eggs, through the unobstructed male and female reproductive tract, are fertilized in the female fallopian tube pot belly, enter the uterus, and develop in an excellent embryo-bed environment to complete the entire pregnancy and delivery. Inflammatory diseases of the female reproductive system such as pelvic inflammatory diseases are the most common and serious infectious diseases in women. The CDC defines it as a group of diseases caused by infections in the upper female reproductive tract, including endometritis, tubal inflammation, tubo-ovarian abscess and pelvic peritonitis. 60% of pelvic inflammatory diseases have mild symptoms or even no symptoms of discomfort and are often mistaken for menstrual cramps and mistaken for treatment. This is called occult pelvic inflammatory disease, if there is no inflammatory mass or pelvic fluid, only the body of the uterus, adnexal edema, congestion, ultrasound examination can not be found. Pelvic inflammatory disease can be confined to one area or involve several areas at the same time. If the degree of inflammation does not affect conception, the patient can conceive successfully. However, if the inflammation involves the endometrium and affects the regeneration, repair and normal contraction of the endometrium, it may lead to fetal abortion. Fetal abortion may also be triggered by inflammation affecting the function of the ovaries. Infertility can be caused by the spread of inflammation due to miscarriage and uterine clearance after fetal abortion if it involves the fallopian tubes and leads to tubal obstruction. A poorly patent fallopian tube can cause infertility also easily lead to ectopic pregnancy. Clinical cases of ectopic pregnancy or secondary infertility after 1-2 abortions are common in patients. How to Prevent Fetal Suspension and Secondary Infertility Improve preconception checkups for both spouses and advocate the same examination and treatment for both spouses. Obtain timely information on reproductive health care, reduce bad habits and prevent or carry out targeted treatment. Do a gynecological internal examination every six months to a year to detect hidden pelvic inflammatory disease in time. Regular gynecological examinations are a talisman for women to prevent and control pelvic genital infections and prevent pelvic adhesions. The standard gynecological internal examination is not just to check the vagina and cervix and take some secretions for a routine white belt examination, but must be performed as a double examination. The absence of duplex examination causes some patients with hidden pelvic inflammatory disease that should have been detected to go undetected, even until serious sequelae such as infertility, ectopic pregnancy, or fetal abortion occur, and then they are discovered to be due to pelvic inflammatory disease. If you have pelvic inflammatory disease, the chances of infertility are much higher for those who are treated after 3 days than those who are treated within 3 days. Therefore, it is best for women who are sexually active to go to the hospital every six months to a year for a gynecological examination that includes internal gynecological examination, and once you are diagnosed with the disease, start antibiotic treatment early under the guidance of your doctor.