Daytime lumbar pain and nighttime lumbar pain can be caused by the following reasons: 1. tumor of the lumbar spine, when there is a tumor or metastasis in the lumbar spine, there can be resting pain in the lumbar region at night, which is a characteristic of lumbar tumor pain. This is a characteristic of lumbar tumor pain. At this time, CT and MRI of the lumbar spine should be checked early as well as blood tests for diagnosis and early treatment; 2. osteoporosis, severe osteoporosis can have lumbar pain at night when sleeping, but no pain or mild pain during the day, especially when there is a compression fracture of the lumbar vertebrae, the pain is more obvious. In this case, we should check the X-ray, CT and blood test of the lumbar spine for diagnosis, and if necessary, go to the endocrinology department to find out the cause; 3. Severe lumbar muscle strain and lumbar dorsal fasciitis can also have lumbar pain at night when sleeping, but it can be relieved after moving around for a while during the day. This is the time to diagnose by early physical examination and examination to exclude other diseases.