Pregnant women need to open the uterus after regular contractions occur during labor, and regular contractions can cause abdominal pain. The fetus grows faster in late pregnancy and will occupy the whole uterus. Regular contractions will pull the uterine muscles and surrounding fibers at the inner cervical opening, and the abdominal muscles will be tense, which, together with the pressure of the fetal head and amniotic fluid, will cause the inner cervical opening to expand upward and outward, and the cervical canal will gradually become shorter until it disappears. As the labor progresses, the opening of the cervix will gradually widen and the pain will increase. When the opening of the uterus reaches about 10 cm, the fetal head can be gradually exposed and the fetus can be delivered vaginally, and the whole process can be accompanied by different degrees of abdominal pain. In addition, each person’s physical condition is different, and a few pregnant women may experience pain in the vulva, lower back or other parts of the body. At present, pregnant women can reduce the pain of opening the uterus by means of anesthesia, but it is usually administered during the process of opening the uterus and cannot be used in advance. It is recommended that pregnant women should follow the doctor’s instructions for regular checkups during pregnancy. If regular contractions occur during labor, accompanied by abdominal pain, they need to go to the hospital accompanied by their family members in time for checkups and be prepared for labor. It is also necessary to actively replenish energy and maintain strength during labor to help the fetus to be born smoothly.