Too big belly like pregnancy may be caused by indigestion, accumulation of abdominal fat or some organic diseases. 1. Indigestion: Indigestion will lead to abnormal function of intestinal peristalsis, which is manifested as flatulence and will show an enlarged stomach. 2. Abdominal fat accumulation: when the energy intake is greater than the energy consumption, there will be excess energy, resulting in fat accumulation, fat accumulation in the abdomen, showing a big belly. 3. Organic diseases: such as cirrhosis of the liver caused by a large amount of ascites, kidney failure produced by ascites or abdominal tumors and other diseases will show the phenomenon of abdominal enlargement. If the belly is too big like pregnancy, exclude indigestion, abdominal obesity, it is recommended to go to the hospital in time for a comprehensive examination, in order to clarify the diagnosis, so as not to delay the disease.