The lower segment of the uterus is only 1cm in non-pregnancy, and at the end of pregnancy, it stretches to 10cm, and in a cesarean section, the lower segment is cut at 10cm, and after delivery, the lower segment shrinks back to about 1cm. Therefore, the real scar is only 1~2cm, and the expansion coefficient of this scar is very small when you are pregnant again, so the scar will not expand and become thinner, and the scar is stronger than the uterine muscle, so it will not rupture naturally, and the site of rupture must be the muscular tissues other than the scar. Clinically, uterine rupture is mostly caused by the indiscriminate use of oxytocin during labor and kicking and pressing the abdomen to assist labor; in a few cases, it is caused by cephalopelvic disproportion or fetal malposition that is not detected in time. Uterine rupture is a long and complicated process, which is categorized into preterm rupture, partial rupture and complete rupture. If you have a trial of labor in the hospital, you will be able to detect the rupture in time and have a cesarean section instead, and you will not be in danger. This is because rupture with precursor is: maternal abdominal pain from paroxysmal pain to persistent tear-like pain, maternal hematuria, howling and wailing; abdominal pathologic contraction link climbing, unless the family and the doctor is a big fool, will develop uterine rupture, the crisis of the mother’s and baby’s life. It is unscientific and unjust to deny a trial of labor with a history of cesarean section. Now it has become one of the means of profiteering for some hospitals, foreign hospitals, hypnosis water birth, most of the cesarean section can be delivered smoothly, and no lateral incision.