Sudden lumbar pain when bending may be lumbar muscle strain, lumbar disc herniation, supraspinatus or interspinous ligamentitis and lumbar spine small joint disorders, etc., you can rest in bed, under the guidance of the doctor oral analgesic medication, local closure treatment. 1. Lumbar muscle strain: mostly due to sudden and large-scale movements, straining the lumbar muscles leading to pain, at this time, you can rest, to avoid large-scale lumbar activities, physical therapy and hot compresses, to relieve muscle spasm and localized edema, to improve blood circulation in the lumbar region, pain symptoms are more serious, oral analgesic drugs such as diclofenac sodium. 2. Lumbar disc herniation: patients with lumbar disc herniation may experience severe back pain under sudden and strenuous activities. Conservative treatment can be carried out first with rest, braking, local physical therapy or oral pain medication, while patients with ineffective conservative treatment need to consider surgical treatment. 3. Supraspinous or interspinous ligament inflammation: for patients with supraspinous or interspinous ligament inflammation, sudden bending movements can cause supraspinous or interspinous ligament inflammatory reaction, appearing bending suddenly back pain dare not move symptoms. Treatment can be braking and physical therapy and hot compresses. You can also take oral non-steroidal anti-inflammatory drugs such as celecoxib and other treatments, but also for local closed treatment. 4. Lumbar spine small joint disorder: sudden bending movement can lead to lumbar spine small joint disorder, resulting in lumbar pain dare not move phenomenon. Need to brake, bed rest. Wear a waist cuff and physical therapy. You can also take non-steroidal anti-inflammatory drugs such as ibuprofen. Bending back pain is afraid to move may also have vertebral fractures and tumors, etc. It is recommended that patients seek timely medical attention to avoid delays in the condition.