Bleeding with clots after pregnancy may be caused by pre-eclampsia, inevitable abortion, ectopic pregnancy, placenta praevia, placental abruption or some gynecological organic diseases. 1. Pre-eclampsia: If the pregnant woman is stimulated by various adverse factors, resulting in mild separation of the gestational sac from the uterine wall causing pre-eclampsia, local tissue capillary rupture and bleeding, it may cause vaginal bleeding with clots after pregnancy. 2. Inevitable abortion: if the embryo growth and development is abnormal, fetal death in the uterus, the embryo and its affiliated tissues are discharged from the uterine cavity, it may cause bleeding clots. 3. Ectopic pregnancy: If the gestational sac grows and develops outside the uterine cavity and is compressed by local tissues, resulting in rupture of the sac and bleeding, the above symptoms may occur. 4. Placenta praevia: after 28 weeks of pregnancy, if the placenta is attached to the lower part of the uterus, or even the lower edge of the placenta reaches or covers the inner mouth of the cervix, and its position is lower than that of the fetal prelude, it is called placenta praevia, and it may cause bleeding due to the rupture of blood vessels of the placenta locally in the middle and late stages of pregnancy because of contractions, and it may manifest itself as blood clots. 5. Placenta previa: when the placenta refers to the normal position of the placenta after 20 weeks of gestation before the delivery of the fetus, part or all from the uterine wall, belongs to the late pregnancy serious complications, the disease develops rapidly, if not handled in time can endanger the life of the mother and child, can also be manifested as a blood clot in the vagina, accompanied by abdominal pain and tonic contractions. 6. Organic gynecological diseases: If there is a combination of precancerous or cancerous cervical lesions after pregnancy, it may also lead to vaginal bleeding with blood clots. There may be other reasons for post-pregnancy bleeding with blood clots, and it is recommended to seek timely medical treatment to avoid seriously jeopardizing the safety of mother and child.