Pregnant women appear belly tightness is generally due to the normal phenomenon caused by the enlargement of the uterus, mainly thin women are prone to appear, may also be due to the appearance of uterine contractions caused by the belly hardening symptoms. A, physiological phenomenon: generally in about 5 months of pregnancy, usually pregnant women can feel the bulging uterus below the navel. If the pregnant woman is lighter, the body mass index is small, subcutaneous fat, especially subcutaneous fat accumulation in the abdomen is less, easy to appear belly tightness, in the bladder filling and lying position, belly tightness can be more obvious. This is generally a normal phenomenon, the abdominal wall tightness is light, can be improved by improving the position, such as taking the side lying position to improve, without excessive tension. Second, the pathological phenomenon: 1, pseudo contractions: due to the increased sensitivity of the uterine muscle layer in late pregnancy, can appear tight belly, manifested as irregular contractions, pregnant women often feel a slight pain, short duration, long intervals, this situation does not require excessive worry, generally can be self-relieved, pregnant women try to bed rest, regular maternity checkups, closely observe the fetal heart and fetal movement changes can be; 2, labor: if it is If there is tightness in the stomach, accompanied by paroxysmal pain, which is more regular, the pain interval is gradually shortened, the pain time is gradually lengthened, and the pain is gradually aggravated and cannot be relieved, it may be the contraction caused by labor, if it is accompanied by vaginal bleeding and fluid flow, it is necessary to go to the hospital in time to determine whether it is necessary to be admitted to hospital for labor through further examination and evaluation. Therefore, if you have symptoms of tightness in your belly that cannot be relieved, it is recommended to go to the hospital to improve the relevant examination and give timely and effective symptomatic treatment after a clear diagnosis. Pregnant women should adjust their mindset, avoid excessive emotions and anxiety, and closely observe the fetal heartbeat and movement of the fetus.