Lower belly bloating pain is commonly caused by the following reasons: appendicitis, pelvic inflammatory disease, intestinal obstruction or constipation. 1. Appendicitis: appendicitis is typically characterized by metastatic right lower abdominal pain, due to the inhibitory effect of inflammation, which affects the digestion and absorption of food, so the symptoms of abdominal distension will occur. 2. Pelvic inflammatory disease: it is the inflammation of the uterus, adnexa and the surrounding connective tissues, which is manifested as pain in the lower abdomen, and the inflammation will also lead to abdominal distension. 3. Constipation or intestinal obstruction: the excretion of feces will be obstructed, due to the accumulation of feces in the intestines, so it will lead to abdominal distension, and it will lead to pain, usually flatulence or colic. It is recommended that the patient go to the hospital, according to the patient’s condition, improve the relevant examination, such as blood routine, ultrasound, abdominal plain film, etc., after a clear diagnosis, follow the doctor’s instructions to standardize the treatment.