Aunt generally refers to menstruation, menstruation stomach bulging, consider and late luteal estrogen and progesterone withdrawal, prostaglandin secretion caused by a lot of, may also be cold. 1. Late luteal phase estrogen and progesterone withdrawal: Late luteal phase estrogen and progesterone withdrawal will affect the physiological changes of the menstrual cycle, which will lead to a variety of physical symptoms, such as abdominal distension, constipation, limb edema, weight gain, and so on. 2. High secretion of prostaglandins: The increased secretion of prostaglandins during menstruation will also enter the blood circulation, thus causing digestive symptoms, such as diarrhea, nausea, vomiting, loss of appetite and other digestive symptoms. 3. Cold: Some women will experience digestive symptoms during menstruation, and if they eat ice cream, cold drinks, or wear less clothing, they will catch a cold, aggravating their digestive symptoms and causing bloating and abdominal pain. Menstruation stomach bulge usually does not last too long, the symptoms will disappear after menstruation stops, if the symptoms can not disappear, to see a doctor as soon as possible.