Spontaneous abortion can be categorized into complete abortion and incomplete abortion. Complete abortion does not cause much harm, while incomplete abortion requires removal of the uterus, which is relatively harmful. Complete abortion refers to all the pregnancy discharge, the mother’s uterine cavity without residual tissue, the cervical opening can be naturally closed, the uterus is close to the normal size, without special treatment, the mother is not very harmful. Incomplete abortion refers to the patient’s part of the pregnancy out of the uterine cavity, there is part of the residual in the uterine cavity or embedded in the cervical opening, which can affect the uterine contraction, resulting in hemorrhage, and in severe cases, even shock, the need for timely treatment of purging, compared to the complete abortion of the harm. Note that after spontaneous abortion patients should actively seek medical attention to clarify whether there is residual, so as not to delay the condition, resulting in adverse consequences.