Normal defecation is abdominal distension is mainly considered gastroenteritis, irritable bowel syndrome and other diseases. 1. Gastroenteritis: when patients eat unclean, indigestible food, resulting in gastrointestinal peristalsis, irregular contraction of the intestinal wall, thus causing abdominal distension, at this time the patient gastroenteritis is not serious, so there will not be constipation, diarrhea and other defecation abnormalities. 2. Irritable bowel syndrome: patients because of emotional fluctuations, mental stress, abdominal distension, abdominal distension and pain and other discomforts, at this time the patient will also have normal bowel movements. In addition, normal bowel movement is abdominal distension may have other reasons, it is recommended that patients go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.