A man’s stomach becomes bigger usually related to liver ascites, fatty liver combined with abdominal obesity, abdominal tumors and other diseases. 1. Hepatic ascites: this disease is also called cirrhotic ascites, which refers to the accumulation of fluid in the abdominal cavity of cirrhotic patients caused by abnormal liver function and portal hypertension. Because of the fluid accumulation in the abdomen, the stomach will become bigger gradually. 2. Fatty liver combined with abdominal obesity: this disease refers to the increase of fat in liver cells and visceral fat caused by lack of exercise, excessive body fat or long-term heavy drinking, resulting in the increase of liver volume, and patients are characterized by fat accumulation in the abdomen, which is often manifested as thickening of the waist and enlargement of the stomach. And some patients will have abdominal distension, constipation and other clinical manifestations, under the effect of multiple factors, patients will have a large stomach. 3. Abdominal tumor: If the stomach suddenly becomes bigger in a short time, accompanied by fatigue or thinness of limbs, you should be alert to the possibility of abdominal tumor. If a man’s stomach suddenly becomes bigger, he needs to go to the hospital in time to find out the cause of the disease and actively cooperate with professional doctors for treatment.