Pain in the lumbar fossa may be caused by lumbar spine diseases, soft tissue diseases of the lumbar back, and urinary tract diseases. 1. Lumbar spine disease: lumbar disc herniation, lumbar spine tuberculosis, lumbar spinal stenosis and other lumbar spine diseases, resulting in local lesions stimulate the nerve root will cause pain, numbness and other discomfort symptoms in the lumbar region. 2. Lumbar back soft tissue diseases: lumbar muscle strain, lumbar back myofasciitis and other soft tissue diseases, can lead to local muscle injury, aseptic inflammation. Overwork and cold stimulation can lead to pain in the lower back. 3. Urological diseases: kidney stones, ureteral stones and other urinary system diseases can cause pain in the lower back, accompanied by radiating pain in the perineum, in addition to carnal hematuria and other manifestations may occur. Lumbar pain should be timely medical treatment, under the guidance of the doctor to actively carry out standardized treatment, which will help the disease early recovery.