The causes of lower abdominal distension include hernia, intestinal obstruction, pelvic inflammatory disease and so on. 1. Hernia: If you suffer from hernia, when the disease attacks, the intestinal tube may enter the hernia sac, causing the blood circulation of intestinal contents to be impaired, triggering the patient to experience distension and pain in the lower abdomen. 2. Intestinal obstruction: If you suffer from intestinal obstruction, due to the slowing down or even stopping of intestinal peristalsis, the intestinal contents can not be discharged from the body normally, but the accumulation of the body, which triggers the patient to have the symptom of bloating and pain in the lower abdomen. 3. Pelvic inflammatory disease: if the female pelvic inflammatory infection occurs, when the inflammatory factor constantly stimulates the pelvic mucosal tissue, triggering local mucosa congestion, edema, redness, swelling, pain and so on, which leads to the symptoms of lower abdominal distension. If you feel the pain in the lower abdomen, it is recommended to go to the hospital in time to improve the relevant examination, to clarify the cause of the disease, and follow the doctor’s instructions for treatment.