Soreness in the middle of the posterior lumbar region may be caused by fatigue injury to the soft tissues of the lumbar region, or it may be caused by vertebral diseases. 1. Lumbar soft tissue injury: the middle part of the lumbar back has thoracolumbar fascia, interspinous ligament and other soft tissues, often stooping labor or long standing and sedentary people, etc., which may cause fatigue injury of these soft tissue parts, resulting in the emergence of aseptic inflammation, causing local blood circulation obstacles and the accumulation of metabolites, stimulation of the nerve root to appear pain symptoms. 2. Vertebral disease: there are lumbar vertebrae in the middle of the back of the waist, when the vertebrae have lesions, there will be lumbar spine instability, compression of the peripheral nerves and other pathological changes, and may also appear in the middle of the middle of the back of the back of the soreness of the symptoms. There may be lumbar disc herniation caused by degenerative lesions of the vertebrae; there may also be vertebral slippage due to aging, obesity and other factors. There may also be other reasons for the pain in the middle of the back, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment under the guidance of the doctor.