There are many reasons for the gradual enlargement of the abdomen, as follows: first, simple obesity, patients who eat too much for a long time and have less activities are easy to form obesity, especially abdominal obesity, and the accumulation of abdominal fat can easily lead to the enlargement of the abdomen; second, ascites caused by various reasons, such as liver cirrhosis, liver cancer, severe hypoproteinemia, intestinal tuberculosis, etc. can form ascites, and the abdomen becomes larger; third, abdominal flatulence, long time abdominal distension or intestinal obstruction can also lead to abdominal enlargement; iv. abdominal tumors such as benign and malignant tumors of the gastrointestinal tract, abdominal cavity and pelvis may lead to abdominal enlargement. Therefore, if patients have unexplained abdominal enlargement, they need to go to the hospital for further examination to clarify the cause. If it is simple obesity, it must be treated with diet and exercise to avoid inducing other metabolic diseases.