Back pain at night when sleeping and not during the day can be caused by several reasons: 1, severe lumbar dorsal myofasciitis and lumbar muscle strain. This can occur at night when the back pain is more obvious when sleeping, but not during the day, it is necessary to conduct early examination and examination to exclude other diseases to diagnose; 2, osteoporosis of the lumbar spine, when the lumbar and thoracic spine have osteoporosis, it can occur at night when sleeping back pain, during the day when no pain or relief, it is necessary to conduct blood tests and lumbar spine X-ray, thoracic spine X-ray examination, early diagnosis and treatment; 3, tumor, when When there is a tumor or metastasis in the spine, back pain can also occur when sleeping, so early diagnosis and treatment should be made by MRI, enhanced MRI, CT and ECT examinations of the spine.