Lumbar compression fracture four months back pain may be due to the original disease has nerve damage, lumbar muscle stiffness adhesion, and osteoporosis and other reasons. 1. Primary disease with nerve injury: lumbar compression fracture four months and still have pain, may be due to the disease at the time of injury is relatively heavy, compression to the spinal cord nerves. Even if the patient is treated with incision-replacement internal fixation surgery, but because the nerve injury itself is slower to recover, there may still be pain after four months of such a situation. 2. Stiffness and adhesion of lumbar muscles: If the injury is treated conservatively, the bed rest time will take about three months, and the weightless training can be carried out on the ground only after three months. During the bed-ridden period, even with rehabilitation training, medication, physical therapy and other means in bed, it is still inevitable that lumbar muscle atrophy, stiffness and muscle tissue adhesion will occur, resulting in lumbar spine compression fracture back pain for four months. 3. Osteoporosis: prolonged bed rest, no activities and functional exercise, will lead to lumbar spine bone loss, four months of the moment will have lumbar spine osteoporosis occurs, it may lead to four months or pain. Lumbar compression fracture four months 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, under the guidance of the doctor to give targeted treatment or treatment.