During pregnancy, with the increasing size of the uterus, it is easy to have a bloated stomach, which is a more common symptom. Of course, if there is more than just the performance of a very distended stomach, does not exclude that caused by other physiological factors or pathological factors, more common in the following cases: 1, physiological factors: 1, hormonal changes: during pregnancy due to hormonal changes in the body, the secretion of estrogen and progesterone increased, so that the abdominal ligament relaxation, inhibit gastrointestinal smooth muscle peristalsis, resulting in indigestion, can appear abdominal obvious flatulence. Appropriate walks during pregnancy and eating more fresh fruits and vegetables can promote gastrointestinal peristalsis and relieve the symptoms; 2. Uterine compression: in the middle and late stages of pregnancy, due to the increasing size of the uterus, which produces a certain amount of pressure on the surrounding soft tissues, may also cause the pregnant woman to produce the feeling of obvious bloating, which can usually recover on its own after delivery. Second, pathological factors: 1, gastrointestinal diseases: during pregnancy due to unclean and improper diet, can cause gastrointestinal diseases, abdominal bloating, usually accompanied by abdominal pain, need to seek medical attention and follow medical advice for treatment; 2, liver disease: if the pregnancy combined with hepatitis, pregnant women may appear abdominal bloating, but also accompanied by other symptoms, need to seek medical attention and follow medical advice for active treatment to prevent the condition to serious 3, gynecological diseases: gynecological infections after pregnancy, such as adnexitis, pelvic inflammatory disease, etc., will also lead to the performance of abdominal distension. This is often accompanied by abdominal pain. In addition, during pregnancy, if abdominal distension is accompanied by abdominal pain or vaginal bleeding, the possibility of pre-eclampsia is not ruled out, and pregnant women need to seek medical attention immediately.