When labor is approaching, many pregnant women are concerned about how their stomach hurts. Now, let’s take a look at the principle and process of abdominal pain in labor. The abdominal pain that occurs during childbirth is mainly the powerful contraction of the uterine muscles, abdominal pain is also known as uterine contraction. At first there is no obvious pattern, the pain is short and the interval is long; some pregnant women do not feel abdominal pain, just a burst of hardness and tightness in the stomach; even part of the people just lumbosacral discomfort and soreness. As time passes, the pressure in the uterine cavity gradually increases, the fetal head descends and presses on the lower part of the uterus causing the opening of the uterus to gradually open up. This process may be accompanied by a small amount of bleeding, which is darker in color. Contractions become more frequent, once every 5 to 6 minutes, lasting more than 30 seconds at a time, with more regular abdominal pain. The duration is slightly longer for first-time mothers, about ten hours, and shorter for menstruating mothers, about 8 hours on average. If the water breaks and there is a strong feeling of bowel movement, you should consider that labor is imminent. The possibility of normal delivery is mainly affected by the size of the fetus, pelvis, labor force, fetal position and other comprehensive conditions. What pregnant women need to do is not to have stress before delivery, relax, reasonable with diet, keep good condition and physical strength, which will help to deliver smoothly.