Small stomach bigger may be related to fat, intestinal flatulence, tumors, female pregnancy and several other reasons, the details are as follows: First, fat accumulation, women are prone to body fat, fat accumulation, fat accumulation in the human abdomen, buttocks, thighs and other parts of the body, may lead to small stomach bigger situation. Second, intestinal flatulence, intestinal flatulence patients often appear suffocating, stomach distension and other symptoms. Third, the tumor, some patients have a history of cirrhosis or uterine fibroids, will also appear small belly enlargement. Fourth, pregnancy, if a woman has had sex during ovulation and has not had a period for a long time, you can see if it is caused by pregnancy. The above are the main reasons for the enlargement of the belly, if it is not very clear what causes it, it is recommended to go to the hospital for a detailed examination to identify the specific cause.