The unbearable bloating of the stomach at 40 weeks may be caused by normal hormonal secretion or approaching labor, or it may be caused by pathological factors, such as gastroenteritis. Under normal circumstances, in the process of pregnancy, the hormonal changes in the body will stimulate the gastrointestinal tract to a certain extent, at this time may cause abdominal distension, nausea, vomiting and other symptoms, which is a relatively normal phenomenon; on the other hand, in the 40th week of pregnancy, the enlarged fetus will be on the stomach and intestines caused by the extrusion, feel uncomfortable stomach bloating, it may be the cause of the imminent labor, and it is recommended to go to the hospital for examination immediately. In addition, some pathological factors may also lead to abdominal pain at 40 weeks of pregnancy, such as food poisoning, gastroenteritis and other digestive disorders, it is recommended to consult a doctor in a timely manner, under the guidance of a professional doctor for treatment and medication. There may be other reasons for bloating, so it is recommended to consult a doctor for a clear diagnosis and actively cooperate with the doctor to treat the cause of the problem.