The bloating of the stomach in the fifth month of pregnancy may be caused by the physiological manifestations of embryonic development or the presence of gastrointestinal diseases in the organism. 1. Embryonic development: 5 months pregnant stomach bloating is usually due to the development of the embryo, the uterus enlargement, resulting in the abdominal cavity organs are squeezed, gastrointestinal peristalsis slow causes, generally belong to the physiological manifestations of pregnancy, is a normal condition. 2. Gastrointestinal diseases: 5 months pregnant stomach bloating may also be due to the presence of gastrointestinal diseases, such as dyspepsia, gastrointestinal inflammation, which leads to the body to slow down the speed of digestion, excessive accumulation of food to produce bloating, and in severe cases will be accompanied by nausea, vomiting. There may be other reasons for the bloating in the 5th month of pregnancy, so it is recommended to go to the hospital in time for a complete examination to determine the cause of the problem, and then give targeted treatment or therapy.