Back pain at night but not during the day can be caused by the following reasons: First, rheumatoid, when rheumatoid involves the spine, there can be back pain when sleeping or back pain in the morning but not during the day, then blood tests and examination of the spine X-ray, CT to diagnose. Second, osteoporosis, when osteoporosis is severe, there can be pain in the spine at night when sleeping, but not in the daytime, then CT and MRI of the spine should be examined to diagnose. Third, tumors of the spine, when there is a primary tumor or metastatic tumor of the vertebral body or accessories of the spine, there can be back pain at night when sleeping and no pain during the day, then the spine should be examined MRI and blood tests for early diagnosis and treatment. Fourth, dorsal myofasciitis, patients with dorsal myofasciitis can also have pain in the back at night when sleeping, but not during the day, which should be checked and examined early to rule out other diseases for diagnosis.