Low back pain may be the result of some retroperitoneal disease (duodenal ulcer, aortic aneurysm, pancreatic cancer; often the pain is localized in the lumbar region of the back, but the movements in the back are full and do not cause pain!). Other causes may include a spinal tumor; infection; pain associated with spondylosis or caused by mechanical factors; intervertebral disc disease, spondyloarthritis, osteoporosis, osteomalacia.