Low back pain is generally caused by a variety of factors, such as acute injury, lumbar muscle strain, chronic lumbar diseases, other diseases outside the lumbar region. 1. Acute injury: many patients in strenuous exercise, lifting heavy objects, waist bump, etc. caused by acute injury to the lumbar region, acute injury did not timely rest, resulting in lumbar injury can not be well recovered, and over time there will be pain. 2. Lumbar muscle strain: such as acute injury has not healed, chronic inflammatory response (long-term poor posture of the lumbar, bending for a long time, etc.), lumbar congenital deformities and acquired injuries (sacral lumbarization, lumbar compression fracture, etc.) recurring lumbar pain. 3. Chronic lumbar diseases: such as lumbar degenerative changes, lumbar disc herniation, lumbar spondylolisthesis and other chronic diseases can also lead to pain in the lumbar region. 4. Other diseases outside the lumbar region: such as inflammation of the urinary system, stones, etc. can also appear in the symptoms of lumbar pain. Lower back pain for a month there may be other reasons, the appearance of lower back pain should not be taken lightly, should go to the hospital in time for examination and further treatment.