In cases of miscarriage or rupture of tubal pregnancy, there may be tenderness with fullness of the posterior vaginal fornix. A tubal pregnancy occurs when the egg is fertilized in the abdomen of the fallopian tube, and for some reason the fertilized egg is blocked in the fallopian tube, and then it is laid and develops in one part of the fallopian tube. Pregnancy in the abdominal region of the tube is the most common, accounting for 50-70%, followed by the isthmus, accounting for 30-40%, and the umbilical and interstitial regions are the least common, accounting for 1-2%. The most common type of pregnancy is tubal abdominal pregnancy at 8 to 12 weeks of gestation. After the fertilized egg is planted in the mucosal folds of the fallopian tube, the developing blastocyst often protrudes into the lumen of the tube due to incomplete formation of the meconium, eventually breaking through the envelope and bleeding, the blastocyst separates from the wall of the tube, and if the whole blastocyst peels off and falls into the lumen of the tube to stimulate the retroperistalsis of the fallopian tube and is discharged into the abdominal cavity through the umbilical end, the tubal pregnancy is completely aborted, and bleeding is usually not much. The cause: 1, fallopian tube dysplasia or malformation: fallopian tube dysplasia, the wall of the muscle fiber development is poor or lack of, the lack of endothelial cilia, its appearance than the normal fallopian tube thin, and curved in a spiral, longer than normal. In cases of developmental malformations, there are multiple holes, diverticula, double fallopian tubes or another underdeveloped fallopian tube, which is a parafallopian tube. 2. Chronic tubal infection: The endometrium of the fallopian tube is stenosed by inflammatory adhesions, and the tubal zigzag or inflammatory adhesions around the fallopian tube often prevent pregnancy. Tubal inflammation not only causes morphological changes, but also makes the endometrial cilia of the fallopian tubes often defective and reduces the peristaltic capacity of the fallopian tubes, which affects the migration of the pregnant eggs. Endometriosis of the fallopian tubes: endometrial tissue can invade the interstitial part of the fallopian tubes, thickening the interstitial part and narrowing or blocking the lumen as one of the causes of fallopian tube pregnancy. It has been suggested that endometrium located in the fallopian tubes, ovaries, and pelvis may have some chemotactic effects on fertilized eggs and induce fertilized eggs to implant in locations other than the uterine cavity. 4, pelvic causes: pelvic tumor compression or traction can make the fallopian tubes thinner and longer, tortuous, and obstruct the passage of pregnant eggs. 5, inappropriate birth control measures: Mathematicians believe that inert or active IUD can effectively prevent intrauterine pregnancy and partially prevent tubal pregnancy, but not ovarian pregnancy. In recent years the incidence of ectopic pregnancies with devices at home and abroad has increased significantly. 6, Tubal pregnancy can be formed by recanalization after sterilization, newborn umbilicals, and technical errors. 7, Chlamydia infection: is a separate and important factor in ectopic pregnancy. When chlamydia antibody titer 1:16, the relative risk is 2.91 titer 1:64 is 3.0.