The pain in the lumbar region when lying down is mainly due to the following reasons: 1. long-term heavy physical labor or long-term standing in daily life, as well as long-term lumbar back heavy, excessive local muscle strain and compression, over time will occur some lumbar muscle strain induced pain. 2. most likely due to bed problems, such as beds too soft or The pain in the lumbar region may be caused by some problems in the lumbar spine, such as common lumbar disc protrusion, lumbar spinal stenosis and lumbar muscle strain or osteophytes of the lumbar spine, all of which may cause pain in the lumbar region when the patient lies down.