This is commonly due to the following reasons: first, appendicitis, the patient’s initial manifestation of pain around the umbilicus, and then the pain gradually shifted to the right lower abdomen, when the inflammation is more severe abdominal cavity will have inflammatory and purulent exudate, resulting in paralytic intestinal obstruction will have abdominal distension, which can be investigated by blood test, abdominal ultrasound or CT to help diagnosis. Second, gynecological diseases, such as ectopic pregnancy rupture bleeding, ovarian cysts, etc., which need to check HCG, abdominal ultrasound, blood routine to help diagnosis. Third, intestinal obstruction, which has many triggers such as abdominal infection, constipation, intestinal torsion, and intestinal tumors. Fourth, incarcerated hernia, which occurs when the intestinal tube is stuck by the hernia ring, such as umbilical hernia, inguinal hernia, femoral hernia, etc., which needs to go to the hospital for physical examination, ultrasound or CT to make a clear diagnosis.