Lying down back pain can be caused by the following reasons: first, osteoporosis, when the lumbar spine has serious osteoporosis, there can be lying down back pain or back pain at night when sleeping, then we should check the lumbar spine X-ray, CT and do blood tests to diagnose. Second, tumors of the lumbar spine, when there are tumors or metastases in the lumbar spine, there can be back pain when lying down or back pain when sleeping at night, then it is necessary to check the MRI and CT of the lumbar spine and blood tests for diagnosis and early treatment. Third, severe lumbar dorsal myofasciitis and lumbar muscle strain can have symptoms of lumbar pain when lying down or lumbar pain when sleeping at night, often bilaterally, which should be diagnosed by early physical examination and examination to exclude other diseases.