The most obvious feature of an empty sac is that the fetal heartbeat and buds are not visible on ultrasound. The report of ultrasound for empty sac suggests that the size of the gestational sac does not quite match the usual days of menopause. The development of this gestational sac is relatively slow, the pregnancy reaction is reduced or disappeared, and some may have bleeding, stomach pain, back pain and miscarriage of the first sign. Empty sac is mostly considered this embryo itself is not well developed, or the mother’s own disease, high blood sugar and blood pressure, may affect the early stage, maternal viral infections, external environmental pollution. If it is determined that the embryo itself is not well developed, is the case of empty sacs as early as possible to do abortion, because the empty sacs continue to exist in the body is likely to lead to poor coagulation mechanism, prone to hemorrhage. Bleeding more easily lead to anemia and infection.