3, dietary factors, if you eat too much food containing high protein is likely to produce more gas. 4, intestinal diseases, common bacterial dysentery, intestinal obstruction, ulcerative colitis, Crohn’s disease. 5, peritoneal diseases, peritoneum-related diseases can also lead to lower abdominal distension, such as acute septic peritonitis, tuberculous peritonitis The disease will be accompanied by abdominal pain, nausea, fever, etc.