The performance of vague abdominal pain in late pregnancy is often due to pseudo contractions, mostly caused by increased sensitivity of the uterine muscles, but not a sign of labor, most of which can be relieved on their own. If the abdominal pain is regular and gradually strengthened, it may be true contractions, often accompanied by cervical changes, and may be caused by gastroenteritis or pelvic inflammatory disease unrelated to pregnancy: 1, pseudo contractions: irregular contractions can occur before the launch of labor, will not cause cervical changes, and generally will not cause preterm labor, more common in late pregnancy. Pregnant women will feel some slight tightness and hardness in the upper part of the uterus, and may experience vague pain in the abdomen, which lasts for a short time, and the pain will not increase and usually disappears on its own. By resting or replenishing fluids, the frequency will be reduced and gradually relieved without special treatment. 2. True contractions: At the beginning of the first stage of labor, the uterine contraction is weak, usually lasts for a short time of about 30 seconds, with a long interval of about 5-6 minutes, and may appear as a vague pain in the abdomen. With the progress of labor, the intensity of contractions gradually increases, the duration gradually lengthens, the interval shortens, and the pain gradually strengthens, which is an important sign of labor. At this time, you need to go to the hospital immediately to prepare for delivery; 3, uterine enlargement: late pregnancy, the uterus increases to a certain extent, may pull the ligament, can lead to pregnant women feel vague pain in the abdomen, pregnant women should pay attention to rest, relax, no special treatment; 4, gastroenteritis: such as recently eat cold and spicy food, or mistakenly eat unclean diet, can cause gastroenteritis, resulting in vague pain in the abdomen, most can gradually heal themselves . Drink more water, pay attention to abdominal warmth, if the abdominal pain is serious or diarrhea, etc., should go to the hospital, under the guidance of doctors to apply drugs that are harmless to pregnant women and fetuses to relieve symptoms; 5, pelvic inflammatory disease: pathogens infecting the mucous membrane of the reproductive tract and then spread upward to cause pelvic inflammatory disease, lower abdominal pain is a common symptom. It is necessary to regularly check the blood and urine routine of pregnant women to confirm that there is no combined urinary tract infection and other diseases, and then perform ultrasound examination to check the specific development of the fetus. In more serious cases, hospitalization is required to receive targeted treatment and medication is used under the guidance of the doctor.