Bleeding during spontaneous abortion can be heavy or light, depending on whether the embryo and its appendages are completely expelled from the uterine cavity. In the case of a complete spontaneous abortion, there is less vaginal bleeding because the embryo and its appendages are expelled from the uterus and the uterus contracts well. If the embryo and its appendages are not completely expelled from the uterine cavity and some tissue remains in the uterus, the amount of vaginal bleeding may be heavier. If the embryo and its appendages are embedded in the cervical opening, the amount of vaginal bleeding may be more, and even endanger the woman’s life. Therefore, the uterus should be cleared in time to promote the early discharge of the residue from the uterine cavity, and give the subsequent treatment to promote uterine regeneration, so the bleeding of spontaneous abortion depends on the specific type of abortion has different manifestations.