The absence of yolk sac may lead to spontaneous abortion. Not all women will have spontaneous abortion problems, if not treated with surgery or medication to clear the uterus in time, it may lead to bleeding, infection or other conditions, so it should be taken seriously. Once the problem of fetal abortion is diagnosed, timely treatment should be carried out under the guidance of a doctor to avoid physical effects. After fetal abortion occurs, the hormone levels in the body will continue to decline, and a faster decline in estrogen and progesterone will lead to uterine contraction and possible spontaneous abortion. The physical quality of each person is different, some people may not always have a spontaneous abortion and need to use drugs or surgery to completely expel the embryo, so pay attention to the reasonable choice of treatment.