Causes of abdominal enlargement of more reasons, specifically the following kinds: first of all need to determine whether because of obesity or abdominal masses caused by abdominal enlargement, if it is usually eat too much fatty foods, or often sedentary habits, easy to lead to the accumulation of fat in the small abdomen. Secondly, the small abdomen becomes large may also be caused by intestinal flatulence, due to various reasons caused by the slowing down of intestinal peristalsis, resulting in the small abdomen is enlarged. Then enteritis, gastrointestinal flatulence, intestinal storage of water, bladder distension can cause small abdominal enlargement. Finally, girls should consider whether there is a tumor of the adnexa, the more common is ovarian cysts, so it will also cause the swelling of the lower abdomen, the lower abdomen will have a feeling of swelling. So it is advisable to go to the hospital for an exhaustive examination to see if it is caused by obesity or abdominal swelling, which needs to be clarified after the cause is clear, under the guidance of the doctor to do further treatment.