There are two possible reasons for the simultaneous occurrence of low back pain and stomach pain: First, in women, it may be a gynecological disease, such as pelvic inflammatory disease or pelvic effusion, or it may be a tumor in the pelvic cavity that causes low back pain accompanied by stomach pain, which is often accompanied by pain in the abdomen and can be accompanied by a feeling of abdominal cramping, and in this case, ultrasound, CT or MRI of the pelvis should be performed for diagnosis and treatment. Second, urinary system diseases, such as kidney stones, when the kidney stones travel downward and get stuck in the ureteral stenosis, low back pain can occur, which is often colic, paroxysmally aggravated, and can radiate to the small stomach, that is, the small abdomen, then the relevant urological ultrasound, urography, urethral laboratory tests are needed for diagnosis.