The main difference between intrauterine pregnancy and ectopic pregnancy lies in the location of the fertilized egg after formation. The former is a normal pregnancy when it is implanted in the uterine cavity, while the latter is an abnormal pregnancy when it is planted outside the uterine cavity for various reasons, and is classified into tubal pregnancy, ovarian pregnancy, abdominal pregnancy, cervical pregnancy, broad ligament pregnancy and uterine stump pregnancy depending on the implantation site of the fertilized egg. The ectopic pregnancy we commonly refer to is mainly tubal pregnancy, which accounts for about 95% of ectopic pregnancies and mainly occurs in the abdomen of the fallopian tube. In the female reproductive system, the uterus is located in the middle of the pelvis and the lower end is connected to the vagina through the cervix, with one fallopian tube on each side. The normal process of fertilization is that the ovum discharged by the woman and the sperm ejaculated by the man meet in the abdomen of the fallopian tube and become a fertilized egg, which gradually moves medially to the uterine cavity with the help of the fallopian tube cilia and then settles in a well-nourished place for further development, i.e. implantation. If the medial fallopian tube is inaccessible due to various reasons, pregnancy in the abdomen, isthmus and interstitial part of the tube may easily occur; or the fertilized egg may move laterally and form a pregnancy in the umbilical end; or even enter the abdominal cavity and develop a pregnancy in the abdomen, ovaries and broad ligament; due to abnormal endometrium and uterine malformation, cervical pregnancy and uterine residual angle pregnancy may occur; across the 21st century, due to the rise of cesarean section, the occurrence of cesarean scar pregnancy in recent years In the 21st century, due to the rise of cesarean section, the occurrence of cesarean scar pregnancy has increased significantly in China. Ectopic pregnancy is limited by the small size of the canal space and the lack of submucosal tissue in the canal wall, which makes it easy to rupture or miscarriage in the early stage. For women of childbearing age with normal sex life, when unexplained abdominal pain after menopause occurs with vaginal bleeding, they need to be alert to the possibility of ectopic pregnancy and need to go to the hospital in time.