There are many causes of right lower abdominal pain, and the following points need to be considered: i. Digestive system diseases on the right side, such as lesions of the ascending colon and ileocecal region, including inflammatory lesions and lesions caused by tuberculosis, tumors, mesenteric lymph nodes, mesenteric arterioscleritis, etc. The most common one is appendicitis, which causes pain in the right lower abdomen with rebound pain on pressure. Second, female genitourinary system diseases, such as pelvic inflammatory disease, adnexitis, etc., women of childbearing age with right lower abdominal pain accompanied by delayed menstruation, but also consider the possibility of ectopic pregnancy, the right ovarian tibial torsion and right corpus luteum rupture will appear severe pain in the right lower abdomen. Third, it may be a disease of the urinary system, such as ureteral stones and kidney stones on the right side will also lead to pain in the right lower abdomen.