Pregnant women’s stomach tightness may be caused by uterine enlargement, false contractions, miscarriage or preterm labor, signs of impending labor, and so on. 1. Uterine enlargement: women pregnant with the development of the fetus uterus will gradually increase, if the pregnant woman itself is thin, less abdominal fat, the uterus will appear after the enlargement of the belly tightness symptoms, is a normal physiological phenomenon. 2. False contractions: False contractions will occur to varying degrees in the middle and late stages of pregnancy, contractions will cause the abdomen to become hard, tightening symptoms, usually in the labor or at night when the obvious, after resting will be better, but also belongs to the normal physiological phenomenon. 3. Miscarriage or preterm labor: pregnant women are not yet due, but frequent stomach tightness, and accompanied by abdominal pain or lumbar pain and other uncomfortable symptoms, may be a sign of miscarriage or preterm labor, you need to go to the hospital in a timely manner to do ultrasound, follow the doctor’s instructions to use magnesium sulfate to inhibit contractions and fertility preservation treatment. 4. Signs of labor: Pregnant women around the due date of stomach tightness symptoms are mostly caused by contractions, belong to the aura of labor, usually accompanied by back pain and abdominal pain, abdominal drop, frequent bowel movements, see red and other symptoms. To observe the contractions, after the regular contractions need to go to the hospital in time to wait for labor. Clinically, pregnant women need to pay attention to rest, avoid too much tension, it is recommended to timely check the causes and symptomatic treatment.