Abnormal pregnancy

Abnormal pregnancy refers to abnormal phenomena that may occur during pregnancy. Clinical manifestations of abnormal pregnancy include hyperemesis gravidarum, miscarriage, ectopic pregnancy, high-risk pregnancy, preeclampsia, placenta previa, placental abruption, premature birth, post-term pregnancy, polyhydramnios or oligohydramnios, intrauterine growth restriction, stillbirth, multiple pregnancy, maternal-fetal blood group incompatibility, umbilical cord abnormalities, premature rupture of membranes, etc.