The causes of lower abdominal distension are as follows: 1. poor gastrointestinal function, intestinal spasm, which is the main cause of lower abdominal distension, often accompanied by changes in the shape of the stool, or poor eating. 2. women with gynecological inflammatory diseases, also prone to lower abdominal distension, common gynecological inflammatory diseases are adnexitis, chronic pelvic inflammatory disease, endometrial inflammation, these inflammatory diseases can appear lower abdominal distension, while 3. If the lower abdominal distension is accompanied by symptoms of frequent urination, urgent urination and painful urination, it is considered to be caused by urinary tract infection or urinary tract disease. If you have lower abdominal swelling and pain, you should pay attention to visit the hospital to understand the specific reasons, and then you can take the next step in treatment.