The most common cause of a large stomach in men is a thick layer of fat in the abdominal wall, because many men will eat too much fatty food and drink a lot of alcohol, but also no physical exercise, it will lead to a gradual increase in the fat layer in the body, which will then be manifested as a large stomach. Patients should actively control the diet, and at the same time with physical exercise, the abdominal fat layer can gradually become less. Some patients are caused by the formation of fluid in the abdominal cavity, such as infectious factors, or even malignant tumors, which require further improvement of relevant tests in the hospital, such as blood routine, liver function, tumor markers, hepatitis B five, abdominal ultrasound or abdominal CT, etc. Some patients also need to check colonoscopy for clarification. If lesions are found, medication or surgery is needed.