The feeling of abdominal swelling may be caused by physiological factors, or it may be a manifestation symptom of certain diseases, such as digestive system diseases such as ulcerative colitis and pancreatitis, urinary system diseases such as ureteral injuries, and gynecological diseases such as pelvic inflammatory disease and endometritis. 1. Physiological factors: due to eating too much gas-producing food, such as sweet potatoes, onions, soy products, etc., which can lead to the production of large amounts of gas in the intestinal tract, which can not be discharged, resulting in abdominal distension. 2. Pathologic factors: (1) Digestive system: the feeling of abdominal swelling may be caused by ulcerative colitis, pancreatitis, colon polyps, gastric cancer, intestinal tumors and other digestive system diseases. (2) Urinary system: when ureteral injury occurs, it may be accompanied by vague swelling symptoms in the abdomen. When the ureter is damaged due to trauma, surgery, endoluminal instrumentation, etc., the urine can extravasate from the ureteral injury to the peritoneal space, causing abdominal swelling, pain and abdominal distension and other symptoms. (3) Gynecological diseases: Due to the special physiological structure of women, when secondary dysmenorrhea, pelvic inflammatory disease, endometritis, salpingitis and other gynecological system diseases occur, it may cause abdominal swelling sensation. In daily life, one should maintain a good diet and eat less gas-producing food. At the same time, there are more causes of vague abdominal swelling, if any discomfort occurs, it is recommended to consult a doctor in time to avoid delaying the condition.