A variety of etiologies exist for patients who experience severe back pain and cannot bend over. Patients may suffer from muscle and tendon strain from strenuous exercise, strong labor, etc., resulting in soreness, pain and restricted movement in the lumbar region. At the same time, it is not excluded that chronic lumbar strain, acute lumbar sprain, lumbar disc herniation and other lumbar diseases, if accompanied by defecation, urination changes, may also be caused by kidney disease: 1. Chronic lumbar strain: patients are in a long-term high cold, high humidity work environment, and need to repeatedly maintain the lumbar flexion posture, easily triggered by chronic strain on the lumbar muscles, ligaments and other tissues due to overstretching. This can lead to intermittent pain in the lumbar region, the inability to bend, and radiating pain and numbness in the lower limbs. 2. Acute lumbar sprain: mainly refers to the continuous pain in the muscles, ligaments, tendons and other tissues of the lumbar region after being stretched by external forces, and when the patient’s position changes, such as bending, the pain will increase, resulting in the inability to continue such activities. 3. Herniated lumbar disc: mainly related to degenerative lesions of the lumbar intervertebral disc, the patient can have severe back pain and cannot bend down the waist. At the same time, pain can also be radiated to the lower extremities, but also accompanied by numbness, weakness and other performance; 4, lumbar fracture: patients with lumbar fracture, often accompanied by the affected area deformity, swelling, muscle spasm, bending restrictions and other symptoms; 5, kidney disease: if the patient not only has severe pain in the back, unable to bend and twist, but also accompanied by hematuria, urinary difficulties and other performance, consider the possible kidney stones, kidney tuberculosis, or even kidney 6, other: lumbar sacralization, spinal stenosis, lumbar spine osteophytes, lumbar spine tumors and other conditions can cause compression of the lumbar spinal cord or nerve roots, which can lead to obvious numbness, activity disorders, muscle weakness, inability to bend and other discomforts.