Low back pain can cause abdominal pain, generally there are two conditions that can cause low back pain with abdominal pain: first, women have gynecological diseases, such as pelvic effusion and pelvic inflammatory disease, then there can be low back pain, accompanied by pain and discomfort in the abdomen, can also be accompanied by symptoms of abdominal cramps, then the gynecological ultrasound and CT examination for diagnosis and treatment. Second, stones or tumors of the urinary system, when a kidney stone travels downward and gets stuck in the narrowing of the ureter, it can cause acute pain in the lower back, often colic, which can then radiate to the abdomen, and in this case, ultrasound or urography of the urinary system should be performed for diagnosis. If a tumor grows in the ureter, it can also cause severe lumbar pain and abdominal pain, so urological tests should be performed for diagnosis and treatment.