The symptoms are relieved after the appearance of flatulence in the small abdomen and the exhaustion through the anus. If this happens, there are generally the following reasons: 1. It may be caused by acute gastroenteritis, which can occur as a result of gastrointestinal tract dysfunction or intestinal spasms caused by acute gastroenteritis. In addition to abdominal distension, there is also more or less pain in the abdomen. 2, there may be various reasons for gastrointestinal tract dysfunction, such as irregular work and rest schedules, irregular diet or anxiety and tension may cause gastrointestinal tract dysfunction. 3, constipation can also occur, because when constipation, due to the blockage of the stool will appear anal exhaustion is not smooth, usually with a history of History of constipation or anal exhaustion is smelly.