Abdominal distension may be caused by intestinal diseases, urinary system diseases, reproductive system diseases and other reasons. 1. Intestinal diseases: enteritis, intestinal polyps, tumors and other intestinal diseases may lead to intestinal mucosal congestion and edema and abdominal distension. 2. Urological diseases: when there are urinary tract infections, urinary stones and other urological diseases, due to pelvic congestion and edema may appear abdominal distension symptoms. 3. Reproductive system diseases: Pelvic inflammatory disease, uterine fibroids, prostatitis and other reproductive system diseases may also lead to pelvic congestion or stimulation of the rectum to appear abdominal distension symptoms. There may be other causes of abdominal distension, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.