Four months pregnant always exhaust, there are several situations: 1, gastrointestinal problems, such as peptic ulcer, gastritis, will lead to changes in the environment of the gastrointestinal, able to produce gas bacilli will increase a lot of, there is always exhaust, if the situation of exhaust is particularly serious, you should consider whether there is agitated colorectal syndrome, which can lead to exhaust, bloating and abdominal pain. 2, eat a lot of easy to flatulence of food, such as potatoes, carrots, beans, sweet potatoes, in the gut by bacterial decomposition, fermentation will produce a lot of gas. For example, potatoes, white radish, beans, sweet potatoes, in the stomach and intestines by bacterial decomposition, fermentation will produce a particularly large amount of gas, there will be exhaust.3, eating habits are not good, usually eat food wolf or usually swallowing action is particularly large, often swallowed into the mouth, there will be a lot of air into the stomach and intestines, there will be a total of exhaust.4, the characteristics of the pregnancy, the pregnant woman in the body of the hormone a lot of progesterone, it will be on the intestinal peristalsis, the secretion of stomach acid will also have a reduction in. The secretion of gastric acid will also be reduced, and there will always be exhaust.