When pelvic inflammatory disease or pelvic effusion occurs, pain in the small abdomen can occur along with pain in the lower back, and ultrasound and CT examination of the pelvis should be performed for diagnosis and treatment. Second, pelvic tumor, pelvic tumor can also appear pain in the abdomen, and at the same time can be accompanied by lumbago symptoms. Thirdly, kidney disease, when kidney stones appear, they can be stuck in the ureteral stenosis when they travel downward, thus causing back pain, which can then radiate to the small abdomen and lead to pain in the small stomach, then ultrasound, CT or urography of the kidney should be performed for diagnosis and treatment, and if necessary, lithotripsy is needed to make the stones disappear.