The reasons for lower abdominal distension are very many, the most common is the lower abdominal distension that occurs during menstruation, the specific reasons are as follows: 1, mainly due to the obvious pelvic uterine congestion during menstruation, coupled with uterine contraction will appear discomfort in the lower abdomen; 2, non-menstrual reproductive system infection, reproductive system infection will lead to pelvic congestion, edema and the occurrence of pelvic fluid, stimulating the local nerves will appear Most women also have pain in the abdomen and changes in vaginal secretions, with uterine adnexitis being the most common; 3. It is more common for indigestion and even gastroenteritis to occur. You can apply local hot compresses to effectively relieve the discomfort, drink warm water and rest, eat a light diet, avoid spicy food, and go to the hospital if necessary.