Common causes of pain in the middle of the spine in the back include lumbar dorsal fasciitis, supraspinous ligamentitis, ankylosing spondylitis, and so on. 1. Lumbar dorsal fasciitis: mostly due to cold, sports strain, etc., causing aseptic inflammation of the lumbar back, appearing in the middle of the spine pain. 2. Supraspinous ligament inflammation: due to long working hours, stooping and hunching, etc., it induces aseptic inflammation of supraspinous ligament, which manifests as pain in the middle of the spine. 3. Ankylosing spondylitis: inflammation invades the spine, manifesting as pain in the middle of the spine. Caused by back pain in the middle of the spine may also have other reasons, such as rheumatoid arthritis, etc. It is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, and standardized treatment under the guidance of the doctor.