The stomach feels bloated in the third trimester of pregnancy may be due to physiological reasons and pathological reasons such as gastric ulcers and gastritis. 1. Physiological reasons: the hormone levels in the body after pregnancy, coupled with the relative reduction in the activity of pregnant women, will make intestinal peristalsis and intestinal tension weakened, easily caused by the decline in gastrointestinal digestive function, which can lead to abdominal distension, intestinal flatulence and other conditions, making the stomach feel bloated, this is a physiological phenomenon, which can be relieved after the appropriate activities. 2. Pathological causes: such as gastric ulcers, gastritis, etc., because in the third trimester of pregnancy most pregnant women’s early pregnancy reaction has basically disappeared, increased appetite, dietary intake will increase, making the original gastric ulcers, gastritis and other diseases aggravated, resulting in indigestion, intestinal flatulence, epigastric pain and other symptoms, will make the stomach feel bloated, combined with the history and clinical manifestations can assist in the diagnosis. The combination of medical history and clinical manifestations can assist in the diagnosis. When the stomach feels bloated in the third trimester of pregnancy, you can go to the hospital to find out the cause and deal with the problem in a timely manner.