The pain when bending, upright up is fine performance, common in acute lumbar sprain, lumbar disc herniation, lumbar muscle strain, lumbar back muscle fasciitis, etc. Acute lumbar sprain patients often have a more obvious history of injury, common in the long-term maintenance of a labor posture of the population, most can be alleviated by taking drugs or local closure and other treatments. 1, acute lumbar sprain: mostly caused by external pull or sudden change in posture, can Cause muscle, ligament, fascia and other soft tissue injury, or joint disorder, misalignment, etc., the patient can appear lumbar pain, restricted activity and other symptoms, bending may squeeze or pull the affected area, inducing pain. After 24 hours of injury, ice can be applied to relieve pain, and after 48 hours, hot compresses can be applied to promote the dissipation of inflammation. It is recommended that patients minimize activities, and at the same time, under the guidance of a doctor, apply non-steroidal anti-inflammatory drugs or perform local closure therapy as appropriate; 2. Lumbar intervertebral disc herniation: degenerative lesions occur in the lumbar intervertebral discs, and the discs can be herniated by external forces, thus stimulating or compressing nerves and causing painful symptoms, coughing, sneezing, bending, squatting and other movements. Coughing, sneezing, bending, squatting and other actions can induce or aggravate the pain. If the pain is obvious, non-steroidal anti-inflammatory drugs can be used to relieve pain, but also through pelvic traction, massage, acupuncture, etc. If necessary, surgical treatment is also feasible; 3, lumbar muscle strain: this disease is common in middle-aged people, manifested as lumbar pain and swelling, can be relieved after rest. There are fixed pressure points in the painful area, and lumbar pain can occur when bending over. The difference with lumbar disc herniation is that there is no nerve involvement, and local closure of painful points is feasible. 4. lumbar back myofasciitis: Mostly due to cold or chronic strain resulting in lesions in the fascia and muscle tissue of the lumbar back, mainly manifested as increased pain in the morning and evening, relieved during the day, diffuse pain in the lumbar back, bending and pulling the back tissue may cause pain, which leads to the appearance of this symptom. Treatment is mostly based on the removal of the cause combined with drug therapy, if necessary, also feasible closed treatment, acupuncture, massage, etc.; 5, other: such as lumbar ligament inflammation, lumbar spondylolisthesis, etc. may also cause this symptom, need to see a doctor to further clarify before symptomatic treatment. In addition, it is recommended that patients pay attention to rest, avoid excessive lumbar activities, reduce bending and weight-bearing, etc., to avoid aggravation of symptoms. If the pain is severe, it is recommended that the patient seek medical attention in a timely manner to clarify the cause and carry out treatment.