The elongation of the gestational sac can be caused by a variety of reasons, including abnormal quality of the embryo, the position of the gestational sac itself is too low, or the pregnant woman’s own uterine cavity is elongated, and so on. The elongated gestational sac is usually observed under ultrasound, and the most likely cause is due to the abnormal quality of the embryo, which is prone to abdominal pain and pre-miscarriage or spontaneous abortion. The normal gestational sac is round or oval, but clinically there are some women who have elongated gestational sacs, but the quality of the embryo is not abnormal, which may be due to the position of the gestational sac is too low, or the uterine cavity is elongated, resulting in poor morphology of the gestational sac during its growth and development. The cause of the elongated gestational sac needs to be determined by the doctor and given targeted treatment.