There are various reasons for the swelling of the belly in the eighth month of pregnancy, which may be physiological or pathological, so you need to pay attention to the specific situation. The reason is that in the eighth month of pregnancy, when the fetus grows more obviously and the belly bulges forward, the center will shift to show the small abdominal cramps, and when there are false contractions will also show obvious distension, tightness and hardness of the belly. These conditions are physiological and can be tolerated. However, if there is preterm labor, there will also be a significant feeling of swelling, accompanied by persistent uterine contractions and possibly vaginal bleeding, which should be determined by ultrasound.