The main cause of large stomach and belly is indigestion and overeating, some people have large stomach and belly is caused by the phenomenon of flatulence in the digestive system, accompanied by nausea, vomiting, loss of appetite and other phenomena, when the phenomenon of indigestion, the food in the intestine can not be excreted by the body as soon as possible, in the digestive system will remain longer, in the process of retention will produce a lot of gas on the stomach wall In the process of retention, a large amount of gas will be produced to fill the stomach wall, and the patient will have a large stomach and tummy. The patient will have a large stomach and tummy. You should try to chew and swallow slowly to reduce the burden on the stomach and intestines. Many people in the diet will appear overeating phenomenon will also cause a large stomach, stomach, overeating will lead to a large accumulation of the contents of the stomach, resulting in the stomach will appear enlarged phenomenon. Excessive intake of food leads to the conversion of calories into fat deposits in the body, will be more likely to obesity, especially leading to thickening of abdominal fat to look belly will also be larger.