The main reasons for the increase in exhaustion of pregnant women are: 1. dietary factors, because during pregnancy, in order to ensure the normal growth of the fetus, most pregnant women eat more protein food, meat food and greasy food, the digestion process of such food in the gastrointestinal tract will produce a lot of gas, then there will be increased exhaustion. 2. intestinal flora imbalance, because the immunity of pregnant women during pregnancy is relatively low. 3, the intestinal peristalsis is slowed down, due to the influence of progesterone, HCG and other hormones in early pregnancy, the peristalsis of the intestine is relatively slow, the gas produced during the digestion of food gathered in the intestine, the phenomenon of intestinal flatulence will appear exhaust. The increase of exhaust gas will occur.