Lumbar pain when lying can be caused by the following kinds of reasons: first, serious lumbar dorsal myofasciitis and lumbar muscle strain, these two diseases are often caused by cold and strain in the lumbar region, can have symptoms of lumbar pain when lying, can also have pain aggravated in the morning, after a while of activity can be improved, this time to early physical examination and examination, to exclude other diseases to diagnose. Second, osteoporotic low back pain, when serious osteoporosis, especially when there is a vertebral compression fracture, can have pain in the back when sleeping, then we should check the lumbar spine X-ray, CT and blood tests to diagnose, if necessary, to the endocrinology department to identify the cause. Thirdly, tumor, when there is a tumor or metastasis in the vertebral body of the lumbar region, there can be back pain when lying down or obvious back pain when sleeping at night, which is the resting pain of the tumor, then the MRI, CT and blood test of the lumbar spine should be examined to diagnose.