Soreness when bending over may be caused by physiological reasons such as overwork, and pathologic reasons such as trauma, lumbar fasciitis, lumbar degenerative diseases. 1. Physiological reasons: due to prolonged exertion or bending over and bearing weight, lactic acid accumulates in the lumbar muscles of patients and cannot be eliminated in time, so the patients may have lumbar muscle pain when bending over. 2. Trauma: due to excessive exercise or collision and other traumatic injuries caused by lumbar bones, muscles, ligaments and other tissues of the injury, the patient stooping to pull the corresponding tissues, the patient may appear lumbar pain, swelling, restricted movement and other symptoms. 3. Lumbar fasciitis: aseptic inflammation of the lumbar fascia, muscles and other tissues caused by long-term stooping and laboring, which stimulates the surrounding tissues when the patient bends down, resulting in lumbar pain and soreness. 4. Lumbar degenerative diseases: common diseases such as lumbar disc herniation, lumbar spinal stenosis and other diseases, the patient bends over when pulling the compressed nerves, the patient can be induced to appear lumbar pain or pain aggravation. Bending back pain may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, give targeted treatment or treatment.