The reasons why women have a big belly are as follows: 1, obesity: more common and important reason, some female friends have no discomfort, general obesity, especially manifested as more abdominal flab; 2, pregnancy: young women will become bigger after pregnancy; 3, abdominal diseases: such as abdominal tumors, including ovarian cancer, stomach cancer, intestinal cancer, etc., and further progression there may be ascites. The stomach will look larger when there is more ascites and there may be other discomfort manifestations. If it is stomach cancer, there will be discomfort in eating, which needs to be combined with related manifestations for preliminary judgment. In any case, if you have the above symptoms, you need to go to the hospital for consultation in order to make a clear diagnosis.