Back pain can be caused by the following causes: 1, tumors of the spine, when there are tumors or metastases in the spine, can lead to back pain in the spine, it is necessary to check the spine early MRI, CT to diagnose and early treatment; 2, osteoporosis of the spine, when there is severe osteoporosis of the spine, can have back pain in the spine, especially when there is a compression fracture of the spine, pain More obvious. In this case, early physical examination, early X-ray, CT and blood tests of the spine to diagnose and treat; 3, rheumatoid diseases, rheumatoid involvement of the spine, can lead to pain in the back of the spine, can be accompanied by pain at the sacroiliac joint; 4, sacroiliac arthritis involving ankylosing spondylitis, then there can be pain in the back of the spine, can have pain at the sacroiliac joint. This is diagnosed by early physical examination, early x-ray of the sacroiliac joint and lumbar spine as well as laboratory blood tests.