Pregnant 17 weeks to afternoon stomach bloating may be caused by physiological reasons such as uterine enlargement, may also be caused by gastrointestinal diseases and other pathological reasons, need to be analyzed. 1. Physiological reasons: the increasing size of the uterus on the pelvic organs pressure, affecting intestinal peristalsis may cause bloating, pregnant women can adjust the dietary structure, eat small meals, eat more easily digestible food. 2. Pathological reasons: pregnant women due to gastrointestinal diseases such as indigestion, chronic gastritis and other gastrointestinal tract gas, may lead to symptoms of bloating. There may also be other reasons for the bloated stomach during 17 weeks of pregnancy.