Lower abdominal distension may be caused by improper diet, pelvic inflammatory disease, intestinal obstruction and other factors. 1. Improper diet: In daily diet, when consuming too spicy and stimulating food, it may cause water to be absorbed in the intestines, resulting in slowing down of peristalsis and accumulation of food in the intestines, thus resulting in the phenomenon of bloating and distension in the lower abdomen. 2. Pelvic inflammatory disease: usually due to inflammation and infection, due to the stimulation of inflammation, will lead to the uterus and pelvis in a state of congestion, resulting in the phenomenon of lower abdominal distension. 3. Intestinal obstruction: usually due to foreign body blockage, roundworms and other factors lead to intestinal obstruction, the contents can not be eliminated, accumulated in the intestine, thus appearing in the lower abdomen bloating phenomenon. Lower abdominal distension, may also be related to adnexitis, prostate hypertrophy and other diseases, based on a symptom can not accurately determine the cause, but also need to be combined with the characteristics of the medical history and the results of the examination to determine the patient is recommended to timely medical treatment, do not be negligent, so as not to delay the condition.