The presence of a yolk sac is not a complete gravidarium, but a partial gravidarium. Complete hyperemesis gravidarum is characterized by a blister-like condition that occupies the entire uterine cavity, with no sign of the fetus. Partial hyperemesis gravidarum is often associated with embryonic or fetal tissue. Complete hyperemesis gravidarum is characterized by a blister-like mass that fills the uterine cavity, with no trace of the fetus, its appendages, or the fetus. The blisters are shaped like grapes with thin fibrous connections, varying in size from a few millimeters to several centimeters in diameter, and are often mixed with blood clots and fragments of meconium. Partial hyperemesis gravidarum has only a portion of the chorionic villi forming a blister, often with fetal tissue or embryo, such as a yolk sac. Moreover, the fetus is usually dead, rarely combined with a full-term baby, and often accompanied by developmental delay or multiple malformations. Patients with hyperemesis gravidarum should go to the hospital in time and receive standardized treatment under the guidance of the doctor.